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About Precision Flow-Adjustment Valves
More
Panel-Mount Threaded Precision Flow-Adjustment Valves
- Valve Type: Needle
- For Use With: Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon
For installation in instrument panels, these valves have a hex nut and threads below the handle. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. All valves have metal-to-metal seats that resist temperature fluctuations. They have a nut that can be tightened to compress the packing if it leaks.
Valves with a 303 stainless steel needle are more corrosion resistant than valves with a brass needle.
For technical drawings and 3-D models, click on a part number.
| Pipe Size | Max. Pressure | Temperature Range, °F | Panel Cutout Dia. | Needle Material | End-to-End Lg. | Port-to-Port Lg. | Each | |
Brass Body—Straight | ||||||||
|---|---|---|---|---|---|---|---|---|
NPT Female × NPT Female | ||||||||
| 1/4 | 500 psi @ 180° F | -20° to 180° | 9/16" | 303 Stainless Steel | 1 3/4" | __ | 0000000 | 000000 |
| 1/4 | 500 psi @ 180° F | -20° to 180° | 9/16" | Brass | 1 3/4" | __ | 0000000 | 00000 |
Brass Body—90° Elbow | ||||||||
NPT Female × NPT Female | ||||||||
| 1/4 | 500 psi @ 180° F | -20° to 180° | 9/16" | 303 Stainless Steel | __ | 15/16" | 0000000 | 00000 |
| 1/4 | 500 psi @ 180° F | -20° to 180° | 9/16" | Brass | __ | 15/16" | 0000000 | 00000 |
NPT Female × NPT Male | ||||||||
| 1/4 | 500 psi @ 180° F | -20° to 180° | 9/16" | 303 Stainless Steel | __ | 15/16" | 0000000 | 00000 |
| 1/4 | 500 psi @ 180° F | -20° to 180° | 9/16" | Brass | __ | 15/16" | 0000000 | 00000 |
Easy-Set Threaded Plastic Precision
Threaded Flow-Adjustment Valves
- Valve Type: Needle
- For Use With: See table
- Seal Material: Buna-N Rubber
To ensure consistent and repeatable settings, these valves have color-coded handle threads and numerical markings. One full revolution of the handle reveals a new color to indicate the set point. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. The locking knob handle has a ring that prevents accidental adjustment.
Internal check valves actuate when the pressure changes to stop flow control from the controlled direction and allow free flow in the opposite direction. Valves with an internal check valve are often used to control the speed of air cylinders and air-powered motors.
Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
For technical drawings and 3-D models, click on a part number.
Valves | Mounting Nuts | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Temperature Range, °F | Panel Cutout Dia. | End-to-End Lg. | For Use With | Each | Each | ||
Black Glass-Reinforced Polyester Plastic Body | ||||||||||
NPTF Female × NPTF Female | ||||||||||
| 1/8 | 0.26 | 200 psi @ 200° F | 0° to 200° | 1" | 1 15/16" | Air, Oxygen | 0000000 | 000000 | 0000000 | 00000 |
| 1/4 | 0.48 | 200 psi @ 200° F | 0° to 200° | 1" | 1 15/16" | Air, Oxygen | 0000000 | 00000 | 0000000 | 0000 |
| 3/8 | 1.06 | 200 psi @ 200° F | 0° to 200° | 1 3/8" | 2 7/8" | Air, Oxygen | 0000000 | 00000 | 0000000 | 0000 |
| 1/2 | 1.35 | 200 psi @ 200° F | 0° to 200° | 1 3/8" | 2 7/8" | Air, Oxygen | 0000000 | 00000 | 0000000 | 0000 |
| 3/4 | 1.96 | 200 psi @ 200° F | 0° to 200° | 1 3/8" | 3" | Air, Oxygen | 0000000 | 00000 | 0000000 | 0000 |
Black Glass-Reinforced Polyester Plastic Body with Internal Check Valve | ||||||||||
NPTF Female × NPTF Female | ||||||||||
| 1/8 | 0.26 | 200 psi @ 200° F | 0° to 200° | 1" | 1 15/16" | Water, Oil, Air, Argon, Helium, Krypton, Neon, Oxygen, Xenon | 00000000 | 00000 | 0000000 | 0000 |
| 1/4 | 0.48 | 200 psi @ 200° F | 0° to 200° | 1" | 1 15/16" | Water, Oil, Air, Argon, Helium, Krypton, Neon, Oxygen, Xenon | 00000000 | 00000 | 0000000 | 0000 |
| 3/8 | 1.06 | 200 psi @ 200° F | 0° to 200° | 1 3/8" | 2 7/8" | Water, Oil, Air, Argon, Helium, Krypton, Neon, Oxygen, Xenon | 00000000 | 00000 | 0000000 | 0000 |
| 1/2 | 1.35 | 200 psi @ 200° F | 0° to 200° | 1 3/8" | 2 7/8" | Water, Oil, Air, Argon, Helium, Krypton, Neon, Oxygen, Xenon | 00000000 | 00000 | 0000000 | 0000 |
| 3/4 | 1.96 | 200 psi @ 200° F | 0° to 200° | 1 3/8" | 3" | Water, Oil, Air, Argon, Helium, Krypton, Neon, Oxygen, Xenon | 00000000 | 00000 | 0000000 | 0000 |
Plastic Threaded Precision Flow-Adjustment Valves
- Valve Type: Needle
- For Use With: Water, Air, Argon, Helium, Krypton, Neon, Xenon
- Seal Material: EPDM Rubber
Plastic provides a lightweight alternative to metal valves. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. These valves have a hex nut and threads below the handle for mounting through instrument panels.
For technical drawings and 3-D models, click on a part number.
| Pipe Size | Max. Pressure | Temperature Range, °F | Panel Cutout Dia. | End-to-End Lg. | Each | |
Dark Gray PVC Plastic Body | ||||||
|---|---|---|---|---|---|---|
NPT Female × NPT Female | ||||||
| 1/8 | 125 psi @ 140° F | 35° to 140° | 7/8" | 2" | 0000000 | 000000 |
| 1/4 | 125 psi @ 140° F | 35° to 140° | 7/8" | 2" | 0000000 | 00000 |
NPT Female × NPT Male | ||||||
| 1/8 | 125 psi @ 140° F | 35° to 140° | 7/8" | 2 1/4" | 0000000 | 00000 |
| 1/4 | 125 psi @ 140° F | 35° to 140° | 7/8" | 2 3/8" | 0000000 | 00000 |
NPT Male × NPT Male | ||||||
| 1/4 | 125 psi @ 140° F | 35° to 140° | 7/8" | 2 11/16" | 0000000 | 00000 |
White Polypropylene Plastic Body | ||||||
NPT Female × NPT Female | ||||||
| 1/8 | 125 psi @ 140° F | 35° to 140° | 7/8" | 2" | 0000000 | 00000 |
| 1/4 | 125 psi @ 140° F | 35° to 140° | 7/8" | 2" | 0000000 | 00000 |
NPT Female × NPT Male | ||||||
| 1/8 | 125 psi @ 140° F | 35° to 140° | 7/8" | 2 1/4" | 0000000 | 00000 |
| 1/4 | 125 psi @ 140° F | 35° to 140° | 7/8" | 2 3/8" | 0000000 | 00000 |
NPT Male × NPT Male | ||||||
| 1/4 | 125 psi @ 140° F | 35° to 140° | 7/8" | 2 11/16" | 0000000 | 00000 |
| Optional Nickel-Plated Brass Mounting Nuts (10/Pkg.) | 0000000 | Each | 00000 |
Panel-Mount High-Pressure Threaded
Precision Flow-Adjustment Valves
- Valve Type: Needle
- For Use With: Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon
Designed for high-pressure instrumentation applications, these valves are rated for up to 10,000 psi and have a hex nut and threads below the handle for panel mounting. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. All valves have metal-to-metal seats that resist temperature fluctuations. They have a nut that can be tightened to compress the packing if it leaks.
316 stainless steel valves are more corrosion resistant than steel valves.
Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
For technical drawings and 3-D models, click on a part number.
Precision Flow-Adjustment Valves
with Push-to-Connect Fittings
- Valve Type: Needle
- For Use With: Water, Air, Argon, Helium, Krypton, Neon, Xenon
- Seal Material: EPDM Rubber
Insert tubing into the fittings on these valves—no heat, solder, or flux required. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. All valves have a hex nut and threads below the handle for mounting through instrument panels.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Max. Pressure | Temperature Range, °F | Panel Cutout Dia. | End-to-End Lg. | Each | |
Dark Gray PVC Plastic Body | ||||||
|---|---|---|---|---|---|---|
Push to Connect × Push to Connect | ||||||
| 1/4" | 125 psi @ 140° F | 35° to 140° | 7/8" | 2 13/16" | 0000000 | 000000 |
| 3/8" | 125 psi @ 140° F | 35° to 140° | 7/8" | 2 13/16" | 0000000 | 00000 |
White Polypropylene Plastic Body | ||||||
Push to Connect × Push to Connect | ||||||
| 1/4" | 125 psi @ 140° F | 35° to 140° | 7/8" | 2 13/16" | 0000000 | 00000 |
| 3/8" | 125 psi @ 140° F | 35° to 140° | 7/8" | 2 13/16" | 0000000 | 00000 |
| Optional Nickel-Plated Brass Mounting Nuts (10/Pkg.) | 0000000 | Each | 00000 |
Compact Precision Flow-Adjustment
Valves with Barbed Fittings
- Valve Type: Needle
- For Use With: Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon
- Seal Material: Buna-N Rubber
With a low-profile body and a narrow port-to-port length, these valves fit in tight spots. Barbs grip onto tubing, providing a secure hold. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. Valves have metal-to-metal seats that resist temperature fluctuations.
Screwdriver-operated valves require a slotted screwdriver (not included) to open and close.
303 stainless steel valves are more corrosion resistant than nickel-plated brass valves.
| For Tube ID | Max. Pressure | Temperature Range, °F | Panel Cutout Dia. | Port-to-Port Lg. | Each | |
Handle-Operated | ||||||
|---|---|---|---|---|---|---|
Nickel-Plated Brass Body | ||||||
Barbed × Barbed | ||||||
| 1/16" | 180 psi @ 150° F | -40° to 200° | 5/16" | 7/16" | 00000000 | 000000 |
303 Stainless Steel Body | ||||||
Barbed × Barbed | ||||||
| 1/8" | 180 psi @ 150° F | -40° to 200° | 5/16" | 9/16" | 00000000 | 00000 |
Screwdriver-Operated | ||||||
Nickel-Plated Brass Body | ||||||
Barbed × Barbed | ||||||
| 1/16" | 180 psi @ 150° F | -40° to 200° | 5/16" | 7/16" | 00000000 | 00000 |
303 Stainless Steel Body | ||||||
Barbed × Barbed | ||||||
| 1/8" | 180 psi @ 150° F | -40° to 200° | 5/16" | 9/16" | 00000000 | 00000 |
Precision Flow-Adjustment Valves with Barbed Fittings
- Valve Type: Needle
- For Use With: Water, Air, Argon, Helium, Krypton, Neon, Xenon
- Seal Material: EPDM Rubber
Barbs grip onto tubing, providing a secure hold. Turn the handle on these valves to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. All have a hex nut and threads below the handle for panel mounting.
For technical drawings and 3-D models, click on a part number.
| For Tube ID | Max. Pressure | Temperature Range, °F | Panel Cutout Dia. | End-to-End Lg. | Each | |
Dark Gray PVC Plastic Body | ||||||
|---|---|---|---|---|---|---|
Barbed × Barbed | ||||||
| 1/4" | 125 psi @ 140° F | 35° to 140° | 7/8" | 3 3/8" | 0000000 | 000000 |
| 3/8" | 125 psi @ 140° F | 35° to 140° | 7/8" | 3 3/8" | 0000000 | 00000 |
| 1/2" | 125 psi @ 140° F | 35° to 140° | 7/8" | 3 3/8" | 0000000 | 00000 |
White Polypropylene Plastic Body | ||||||
Barbed × Barbed | ||||||
| 1/4" | 125 psi @ 140° F | 35° to 140° | 7/8" | 3 3/8" | 0000000 | 00000 |
| 3/8" | 125 psi @ 140° F | 35° to 140° | 7/8" | 3 3/8" | 0000000 | 00000 |
| 1/2" | 125 psi @ 140° F | 35° to 140° | 7/8" | 3 3/8" | 0000000 | 00000 |
| Optional Nickel-Plated Brass Mounting Nuts (10/Pkg.) | 0000000 | Each | 00000 |
High-Pressure Threaded Precision
Flow-Adjustment Valves for Steam
- Valve Type: Needle
- For Use With: Steam
- Seal Material: PTFE Plastic
To withstand a maximum steam pressure of at least 4,800 psi @ 355° F in applications such as petroleum refineries, these valves are machined from a single piece of metal for seamless construction. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. Valve body is 316 stainless steel for excellent corrosion resistance. Threads and a hex nut below the handle allow you to install these valves in instrument panels. All have metal-to-metal seats that resist temperature fluctuations. Valves have a nut that can be tightened to compress the packing if it leaks.
Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Max. Steam Pressure | Temperature Range, °F | Panel Cutout Dia. | End-to-End Lg. | Each | |
316 Stainless Steel Body | ||||||||
|---|---|---|---|---|---|---|---|---|
NPT Female × NPT Female | ||||||||
| 1/4 | 0.58 | 10000 psi @ 200° F | 6200 psi @ 355° F | -40° to 400° | 7/8" | 2 5/16" | 0000000 | 0000000 |
| 3/8 | 0.58 | 10000 psi @ 200° F | 4800 psi @ 355° F | -40° to 400° | 7/8" | 2 5/16" | 0000000 | 000000 |
| 1/2 | 0.6 | 10000 psi @ 200° F | 4800 psi @ 355° F | -40° to 400° | 1" | 2 5/8" | 0000000 | 000000 |
Precision Flow-Adjustment Valves
with Yor-Lok Fittings for Steam
- Valve Type: Needle
- For Use With: Steam
- Seal Material: PTFE Plastic
For extra gripping power and a strong seal, these valves have Yor-Lok fittings with two sleeves that bite into tubing as you tighten the nut. They are compatible with Swagelok®, Let-Lok, and Parker A-Lok fittings. These valves are often used in petroleum refineries. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. Body is 316 stainless steel for excellent corrosion resistance. For installation in instrument panels, valves have threads and a hex nut below the handle. They have metal-to-metal seats that resist temperature fluctuations. All have a nut that can be tightened to compress the packing if it leaks.
Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
| For Tube ID | For Tube OD | Flow Coefficient (Cv) | Max. Pressure | Max. Steam Pressure | Panel Cutout Dia. | End-to-End Lg. | Each | |
316 Stainless Steel Body | ||||||||
|---|---|---|---|---|---|---|---|---|
Yor Lok × Yor Lok | ||||||||
| 1/16" | 1/4" | 0.6 | 10000 psi @ 200° F | 6200 psi @ 355° F | 7/8" | 2 7/8" | 0000000 | 0000000 |
| 1/16" | 3/8" | 0.6 | 10000 psi @ 200° F | 4800 psi @ 355° F | 7/8" | 2 7/8" | 0000000 | 000000 |
| 1/16" | 1/2" | 0.6 | 10000 psi @ 200° F | 4800 psi @ 355° F | 7/8" | 3 1/8" | 0000000 | 000000 |
Precision Flow-Adjustment Valves
with Yor-Lok Fittings for Chemicals
- Valve Type: Needle
- For Use With: Oil, Acetone, Air, Ammonia, Argon, Butane, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Gasoline, Helium, Isopropyl Alcohol, Kerosene, Krypton, Liquid Argon, Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen, Methanol, Methyl Ethyl Ketone, Mineral Spirits, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Soap Solutions, Sodium Hydroxide, Toluene, Xenon, Xylene
- Seal Material: PTFE Plastic
- Seat Material: 316 Stainless Steel
- Packing Material: PTFE Plastic
- Needle Material: 316 Stainless Steel
For extra gripping power and a strong seal, these valves have Yor-Lok fittings with two sleeves that bite into tubing as you tighten the nut. All are compatible with Swagelok®, Let-Lok, and Parker A-Lok fittings. The 316 stainless steel body and seal, the PTFE seat and packing, and the Monel needle can withstand aggressive and corrosive solutions in chemical-processing applications. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. Threads and a hex nut below the handle allow you to mount these valves in instrument panels. All have a nut that can be tightened to compress the packing if it leaks. Valves have bubble-tight soft seats that provide a tight seal when the valve is completely closed.
Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
| For Tube OD | Flow Coefficient (Cv) | Max. Pressure | Temperature Range, °F | Panel Cutout Dia. | End-to-End Lg. | Each | |
316 Stainless Steel Body | |||||||
|---|---|---|---|---|---|---|---|
Yor Lok × Yor Lok | |||||||
| 1/4" | 0.56 | 7000 psi @ 400° F | -20° to 400° | 0.87" | 2 7/8" | 0000000 | 0000000 |
| 3/8" | 0.56 | 7000 psi @ 400° F | -20° to 400° | 0.87" | 2 7/8" | 0000000 | 000000 |
| 1/2" | 0.56 | 7000 psi @ 400° F | -20° to 400° | 0.87" | 3 1/8" | 0000000 | 000000 |
Precision Flow-Adjustment Valves with
Push-to-Connect Fittings for Chemicals
- Valve Type: Needle
- For Use With: Water, Oil, Air, Argon, Butane, Carbon Dioxide, Citric Acid, Deionized Water, Diesel Fuel, Ethanol, Ethylene Glycol, Gasoline, Helium, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Krypton, Methanol, Mineral Spirits, Natural Gas, Neon, Nitric Acid, Nitrogen, Oxygen, Phosphoric Acid, Propane, Salt Water, Soap Solutions, Sodium Hydroxide, Sodium Hypochlorite, Sulfuric Acid, Toluene, Xenon, Xylene
- Seal Material: Fluoroelastomer Rubber
- Packing Material: PTFE Plastic
- Needle Material: PVDF Plastic
Insert tubing into the fittings on these valves—no heat, solder, or flux required. With a fluoroelastomer seal and a PVDF body, they can withstand aggressive and corrosive solutions in chemical-processing applications. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. Threads and a hex nut below the handle allow you to install these valves in instrument panels. They have a nut that can be tightened to compress the packing if it leaks.
Threaded Precision Flow-Adjustment Valves for Chemicals
To withstand aggressive and corrosive solutions in chemical-processing applications, these valves have a fluoroelastomer seal and a plastic body. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control.
Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
For technical drawings and 3-D models, click on a part number.
- Valve Type: Needle
- For Use With: Water, Air, Butane, Carbon Dioxide, Citric Acid, Diesel Fuel, Ethylene Glycol, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Natural Gas, Nitric Acid, Oxygen, Phosphoric Acid, Propane, Salt Water, Soap Solutions
- Seal Material: Fluoroelastomer Rubber
- Seat Material: PTFE Plastic
- Needle Material: PVC Plastic
- Valve Type: Needle
- For Use With: Water, Oil, Air, Ammonia, Beverage, Butane, Carbon Dioxide, Chlorine, Citric Acid, Deionized Water, Diesel Fuel, Ethanol, Ethylene Glycol, Food, Fuel Oil, Gasoline, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Liquid Carbon Dioxide, Methanol, Mineral Spirits, Phosphoric Acid, Salt Water, Soap Solutions, Sodium Hydroxide, Sodium Hypochlorite, Sulfuric Acid, Xylene
- Seal Material: Fluoroelastomer Rubber
- Seat Material: PTFE Plastic
- Needle Material: Polypropylene Plastic
- Valve Type: Needle
- For Use With: Water, Air, Carbon Dioxide, Citric Acid, Ethylene Glycol, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Natural Gas, Nitric Acid, Oxygen, Salt Water, Soap Solutions
- Seal Material: Fluoroelastomer Rubber
- Seat Material: PTFE Plastic
- Needle Material: Polypropylene Plastic
Precision Flow-Adjustment Valves
with Barbed Fittings for Chemicals
- Valve Type: Needle
- For Use With: Water, Oil, Air, Argon, Butane, Carbon Dioxide, Citric Acid, Deionized Water, Diesel Fuel, Ethanol, Ethylene Glycol, Gasoline, Helium, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Krypton, Methanol, Mineral Spirits, Natural Gas, Neon, Nitric Acid, Nitrogen, Oxygen, Phosphoric Acid, Propane, Salt Water, Soap Solutions, Sodium Hydroxide, Sodium Hypochlorite, Sulfuric Acid, Toluene, Xenon, Xylene
- Seal Material: PTFE Plastic
- Packing Material: PTFE Plastic
- Needle Material: PVDF Plastic
Barbs grip onto tubing, providing a secure hold. To withstand aggressive and corrosive solutions in chemical-processing applications, these valves have a PTFE seal and a PVDF body. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. Threads and a hex nut below the handle allow you to install these valves in instrument panels. They have a nut that can be tightened to compress the packing if it leaks.
Precision Flow-Adjustment Valves with
Push-to-Connect Fittings for Food and Beverage
- Valve Type: Needle
- For Use With: Food, Beverage
- Seal Material: Buna-N Rubber
Insert tubing into the fittings on these valves—no heat, solder, or flux required. Designed for use in food and beverage tubing lines, they adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. Threads and a hex nut below the handle allow you to install these valves in instrument panels. They have a nut that can be tightened to compress the packing if it leaks.
Precision Flow-Adjustment Valves with
Barbed Fittings for Food and Beverage
- Valve Type: Needle
- For Use With: Food, Beverage
- Seal Material: PTFE Plastic
These valves have barbed fittings that grip onto tubing, providing a secure hold. They’re often used in food and beverage tubing lines to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. Threads and a hex nut below the handle allow you to install these valves in instrument panels. They have a nut that can be tightened to compress the packing if it leaks.