How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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About On/Off Valves
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About Backflow-Prevention Valves
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Threaded On/Off Valves for Refrigerant
- Valve Type: Ball
- For Use With: Refrigerant
- Seal Material: PTFE Plastic
- Specifications Met: NACE (National Association of Corrosion Engineers) MR0103, NACE (National Association of Corrosion Engineers) MR0175
Often used in HVAC or refrigeration systems, these valves are designed to control the flow of ammonia, nitrogen, and other harsh chemicals. To prevent accidental spills, a spring on the handle will automatically close the valve if you lose your grip. It’s also known as a deadman’s handle. The ball has a vent to relieve gas buildup when the valve is closed. Made from 316 stainless steel, these valves have excellent corrosion resistance.
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 | Temperature Range, °F | Vacuum Rating, in. of Hg | End-to-End Lg. | For Refrigerant Number | Features | Each | |
316 Stainless Steel Body | |||||||||
|---|---|---|---|---|---|---|---|---|---|
NPT Female × NPT Female | |||||||||
| 1/4 | 8.4 | 2,000 psi @ 100° F | -20° to 500° | 29 | 2 1/16" | R-134A, R-717, R-728, R-744 | Vented Ball | 0000000 | 0000000 |
| 3/8 | 7.2 | 2,000 psi @ 100° F | -20° to 500° | 29 | 2 1/16" | R-134A, R-717, R-728, R-744 | Vented Ball | 0000000 | 000000 |
| 1/2 | 15 | 2,000 psi @ 100° F | -20° to 500° | 29 | 2 1/4" | R-134A, R-717, R-728, R-744 | Vented Ball | 0000000 | 000000 |
| 3/4 | 30 | 2,000 psi @ 100° F | -20° to 500° | 29 | 3" | R-134A, R-717, R-728, R-744 | Vented Ball | 0000000 | 000000 |
| 1 | 43 | 2,000 psi @ 100° F | -20° to 500° | 29 | 3 3/8" | R-134A, R-717, R-728, R-744 | Vented Ball | 0000000 | 000000 |
On/Off Valves with Solder-Connect Fittings for Refrigerant
- Valve Type: Ball
- For Use With: Refrigerant
- Seal Material: PTFE Plastic
- Specifications Met: UL Listed, C-UL Listed, CE Marked
Install these valves in HVAC and refrigeration systems to control CO₂. They are operated with a wrench to give you the leverage needed to manage the flow of highly pressurized gases common in refrigeration systems. Because they require a wrench, these valves can’t be opened accidentally when bumped or snagged. Solder them to metal tubing for a permanent, leak-tight connection. To monitor pressure or fluid flow, attach a gauge to the port. The port can also be used to drain and divert liquid. These valves are full port, so they do not restrict flow.
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.
Gauge Ports | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Copper Tube Size | For Tube OD | No. of | Thread Size | Gender | Thread Type | Flow Coefficient (Cv) | Max. Pressure | Temperature Range, °F | End-to-End Lg. | Drive Style | Drive Size | For Refrigerant No. | Each | |
Wrench-Operated Brass Body | ||||||||||||||
Solder Connect × Solder Connect | ||||||||||||||
| 1/8 | 1/4" | 1 | 7/16"-20 | Male | UNF | 1 | 2,030 psi @ 300° F | -40° to 300° | 5" | External Hex | 13/16" | R-744 | 0000000 | 0000000 |
| 1/4 | 3/8" | 1 | 7/16"-20 | Male | UNF | 4.3 | 2,030 psi @ 300° F | -40° to 300° | 5 1/4" | External Hex | 13/16" | R-744 | 0000000 | 000000 |
| 3/8 | 1/2" | 1 | 7/16"-20 | Male | UNF | 6.2 | 2,030 psi @ 300° F | -40° to 300° | 5 1/2" | External Hex | 13/16" | R-744 | 0000000 | 000000 |
| 1/2 | 5/8" | 1 | 7/16"-20 | Male | UNF | 12.1 | 2,030 psi @ 300° F | -40° to 300° | 5 7/8" | External Hex | 13/16" | R-744 | 0000000 | 000000 |
| 5/8 | 3/4" | 1 | 7/16"-20 | Male | UNF | 19 | 2,030 psi @ 300° F | -40° to 300° | 5 7/8" | External Hex | 15/16" | R-744 | 0000000 | 000000 |
| 3/4 | 7/8" | 1 | 7/16"-20 | Male | UNF | 27.5 | 2,030 psi @ 300° F | -40° to 300° | 7 5/16" | External Hex | 15/16" | R-744 | 0000000 | 000000 |
| 1 | 1 1/8" | 1 | 7/16"-20 | Male | UNF | 48 | 2,030 psi @ 300° F | -40° to 300° | 7 5/16" | External Hex | 1 1/8" | R-744 | 0000000 | 000000 |
| 1 1/4 | 1 3/8" | 1 | 7/16"-20 | Male | UNF | 77 | 2,030 psi @ 300° F | -40° to 300° | 8 1/8" | External Hex | 1 1/8" | R-744 | 0000000 | 000000 |
| 1 1/2 | 1 5/8" | 1 | 7/16"-20 | Male | UNF | 96 | 2,030 psi @ 300° F | -40° to 300° | 9 1/2" | External Hex | 1 1/8" | R-744 | 0000000 | 000000 |
| 2 | 2 1/8" | 1 | 7/16"-20 | Male | UNF | 198 | 2,030 psi @ 300° F | -40° to 300° | 10 7/8" | External Hex | 1 5/8" | R-744 | 0000000 | 000000 |
Check Valves for Refrigerant
- Spring Material: Stainless Steel
- Seal Material: Neoprene Rubber
- Ball Material: Stainless Steel
- For Use With: Refrigerant
Use these valves in refrigeration and air-conditioning systems. All open to allow flow in one direction and close when flow stops or reverses. They solder to copper tubing for a permanent, leak-tight connection.
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 Copper Tube Size | For Tube OD | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Each | |
Copper Body | ||||||||
|---|---|---|---|---|---|---|---|---|
Solder Connect × Solder Connect | ||||||||
| 1/4 | 3/8" | 1.2 | 755 psi @ 300° F | 1 | -40° to 300° | 3 3/4" | 0000000 | 000000 |
| 3/8 | 1/2" | 2.2 | 755 psi @ 300° F | 1 | -40° to 300° | 3 3/4" | 0000000 | 00000 |
| 3/4 | 7/8" | 7.5 | 755 psi @ 300° F | 1 | -40° to 300° | 4 1/2" | 0000000 | 00000 |
| 1 | 1 1/8" | 12.4 | 755 psi @ 300° F | 1 | -40° to 300° | 5" | 0000000 | 000000 |
Nuts for High-Pressure Nipples for Compressed Gas
Slide a high-pressure hose nipple for compressed gas into one of these nuts to connect a pipe to the inlet of a pressure regulator. They are also known as CGA (Compressed Gas Association) nuts and inlet nuts.
Brass nuts have good corrosion resistance and are softer than 316 stainless steel nuts, so they're easier to thread together.
Note: Nuts have a CGA, BS, or DIN number that corresponds to a specific type of gas. Choose a nut with the same number as your tank and other system components.
- Maximum Pressure: See table
- Maximum Temperature: 120° F, except DIN 477 No. 9: 250° F
| Number | Thread Size | Thread Type | Thread Direction | Max. Pressure | For Use With | Each | |
Brass | |||||||
|---|---|---|---|---|---|---|---|
| CGA 660 | 1.035"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Refrigerant Gases | 000000000 | 000000 |
High-Pressure Nipples for Compressed Gas
Commonly used in high-pressure welding applications, these nipples connect your tank to the inlet of a pressure regulator. One side has a threaded pipe end and the other side has a rounded end that sits inside a threaded nut (sold separately) so you can make a threaded connection.
Brass nipples have good corrosion resistance and are softer than 316 stainless steel nipples, so they're easier to thread together.
- Maximum Pressure: See table
- Maximum Temperature: 120° F
Regulator Connection | ||||||
|---|---|---|---|---|---|---|
| For Number (Max. Pressure) | Pipe Size | Thread Type | Lg. | For Use With | Each | |
Brass—Tighten With Wrench | ||||||
| CGA 660 (3,000 psi @ 72° F) | 1/4 | NPT | 1 3/4" | Refrigerant Gases | 000000000 | 000000 |
- Maximum Pressure: See table
- Maximum Temperature: 120° F
| Number | Gender | Thread Size | Thread Type | Thread Direction | Max. Pressure | For Use With | Each | |
Brass | ||||||||
|---|---|---|---|---|---|---|---|---|
| CGA 660 | Female | 1.035"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Refrigerant Gases | 000000000 | 000000 |