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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High-Temperature Sights
Often used in kilns and other heating equipment, these sights have a quartz window that can withstand temperatures up to 1600° F. They're also known as peep sights.
Temp. Range, °F | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Window Dia. | Hex Size | Max. Pressure | Min. | Max. | For Use With | Window Material | Each | |
316 Stainless Steel | |||||||||
NPT Male Thread | |||||||||
| 1/2 | 5/16" | 1" | 150 psi @ 1,600° F | Not Rated | 1600° | Air | Quartz | 0000000 | 0000000 |
| 3/4 | 9/16" | 1 3/8" | 150 psi @ 1,600° F | Not Rated | 1600° | Air | Quartz | 0000000 | 000000 |
| 1 | 11/16" | 1 5/8" | 150 psi @ 1,600° F | Not Rated | 1600° | Air | Quartz | 0000000 | 000000 |
| 1 1/4 | 1 1/16" | 2" | 150 psi @ 1,600° F | Not Rated | 1600° | Air | Quartz | 0000000 | 000000 |
| 1 1/2 | 1 1/4" | 2 1/4" | 150 psi @ 1,600° F | Not Rated | 1600° | Air | Quartz | 0000000 | 000000 |
| 2 | 1 1/2" | 2 3/4" | 150 psi @ 1,600° F | Not Rated | 1600° | Air | Quartz | 0000000 | 000000 |
Sights for Quick-Clamp Sanitary Tube Fittings
Quick-Clamp Fitting, And Tube
Fitting (All Sold Separately)
Monitor food, brewery, chemical, pharmaceutical, and biotech processing lines with these sights that attach to quick-clamp fittings for fast installation and easy removal for cleaning. All have a one-piece design, so there are no crevices where bacteria can grow. A
304 stainless steel sights have a ring that's embedded around their shatter-resistant plastic window. This design protects the sights from chipping or cracking while under the stress of the quick-clamp fitting. All withstand harsh cleaners and sanitizers for clean-in-place (CIP) and steam-in-place (SIP) applications. They do not contain Bisphenol A (BPA), Bisphenol B (BPB), or BPA derivatives (BPX), which are chemicals that can contaminate your process lines. All meet ASME BPE design standards for bioprocessing equipment that ensure purity and safety.
For superior strength and reliability, choose 2205 stainless steel sights. All have a glass window that’s melted around a high-strength ring, so they won’t shatter, leak, or lose their shape under high pressure, heat, chemicals, or impact. They withstand harsh cleaners and sanitizers for clean-in-place (CIP) and steam-in-place (SIP) applications. USP Class VI and TUV Rheinland Certified, these sights meet safety standards in the U.S. and Europe. They also meet DIN standards for glass materials used in sights, ASTM standards for materials used in boilers and pressure vessels, and ASME BPE design standards for bioprocessing equipment that ensure purity and safety.
Temp. Range, °F | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | For Flange OD | Window Dia. | Max. Pressure | Min. | Max. | For Use With | Features | Specifications Met | Each | |
304 Stainless Steel Ring with Plastic Window | ||||||||||
| 1" | 1.98" | 1 1/4" | 150 psi @ 70° F | Not Rated | 200° | Water, Acetic Acid, Air, Alcohol-Based Solvents, Compressed Air, Salt Water, Steam | One-Piece Construction | ASME BPE | 0000000 | 0000000 |
| 2" | 2.52" | 1 3/4" | 150 psi @ 70° F | Not Rated | 200° | Water, Acetic Acid, Air, Alcohol-Based Solvents, Compressed Air, Salt Water, Steam | One-Piece Construction | ASME BPE | 0000000 | 000000 |
| 4" | 4.68" | 3 1/4" | 30 psi @ 70° F | Not Rated | 200° | Water, Acetic Acid, Air, Alcohol-Based Solvents, Compressed Air, Salt Water, Steam | One-Piece Construction | ASME BPE | 0000000 | 000000 |
2205 Stainless Steel Ring with Glass Window | ||||||||||
| 1", 1 1/2" | 1.98" | 1" | 230 psi @ 70° F | -40° | 500° | Water, Hydraulic Fluid, Diesel Fuel, Acetic Acid, Air, Alcohol-Based Solvents, Beverage, Chemicals, Compressed Air, Food, Fuel Oil, Gasoline, Inert Gas, Ketone, Oil, Salt Water, Steam | One-Piece Construction | ASME BPE, ASTM A479, DIN 7079, DIN 7080, TUV Rheinland Certified, USP Class VI | 0000000 | 000000 |
| 2" | 2.52" | 1 3/16" | 230 psi @ 70° F | -40° | 500° | Water, Hydraulic Fluid, Diesel Fuel, Acetic Acid, Air, Alcohol-Based Solvents, Beverage, Chemicals, Compressed Air, Food, Fuel Oil, Gasoline, Inert Gas, Ketone, Oil, Salt Water, Steam | One-Piece Construction | ASME BPE, ASTM A479, DIN 7079, DIN 7080, TUV Rheinland Certified, USP Class VI | 0000000 | 000000 |
| 3" | 3.58" | 1 1/2" | 150 psi @ 70° F | -40° | 500° | Water, Hydraulic Fluid, Diesel Fuel, Acetic Acid, Air, Alcohol-Based Solvents, Beverage, Chemicals, Compressed Air, Food, Fuel Oil, Gasoline, Inert Gas, Ketone, Oil, Salt Water, Steam | One-Piece Construction | ASME BPE, ASTM A479, DIN 7079, DIN 7080, TUV Rheinland Certified, USP Class VI | 0000000 | 000000 |
| 4" | 4.68" | 2 3/16" | 150 psi @ 70° F | -40° | 500° | Water, Hydraulic Fluid, Diesel Fuel, Acetic Acid, Air, Alcohol-Based Solvents, Beverage, Chemicals, Compressed Air, Food, Fuel Oil, Gasoline, Inert Gas, Ketone, Oil, Salt Water, Steam | One-Piece Construction | ASME BPE, ASTM A479, DIN 7079, DIN 7080, TUV Rheinland Certified, USP Class VI | 0000000 | 000000 |
Ultra-High-Vacuum Flanged Sights
Add a window to your ultra-high-vacuum system. With a pane of glass sealed inside an ultra-high-vacuum CF flange, these sights bolt onto vacuum chambers, tee fittings, and manifolds. Use a copper gasket (sold separately) to create a seal. Not for use with pressure. To illuminate dark interiors, attach an optional light to the flange with set screws.
Window | Bolt Holes | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| High-Vacuum Flange Size | Flange OD | High Vacuum Connection Type | Max. Vacuum | Dia. | Material | Bolt Circle Dia. | No. of | Dia. | Max. Temp., °F | Each | |
304 Stainless Steel | |||||||||||
| 16 | 1 21/64" | CF | 10 -11 torr @ 72° F | 5/8" | Glass | 1 1/16" | 6 | 11/64" | 660° | 0000000 | 0000000 |
| 40 | 2 3/4" | CF | 10 -11 torr @ 72° F | 1 1/2" | Glass | 2 5/16" | 6 | 17/64" | 660° | 0000000 | 000000 |
| 63 | 4 1/2" | CF | 10 -11 torr @ 72° F | 2 9/16" | Glass | 3 5/8" | 8 | 21/64" | 660° | 0000000 | 000000 |
| 100 | 6" | CF | 10 -11 torr @ 72° F | 3 35/64" | Glass | 5 1/8" | 16 | 21/64" | 660° | 0000000 | 000000 |
High-Vacuum Sights for Quick-Clamp Fittings
Designed with quick-clamp (KF) connections, these sights connect to a port on a high-vacuum chamber, so you can monitor what's happening inside. A sleeve seals the glass window to the body of the sight to prevent leaks. To connect to your chamber, you'll need a clamp and a ring (sold separately). Not for use in pressure applications.
Window | ||||||||
|---|---|---|---|---|---|---|---|---|
| High-Vacuum Flange Size | For Flange OD | High Vacuum Connection Type | Max. Vacuum | Dia. | Material | Max. Temp., °F | Each | |
304 Stainless Steel | ||||||||
| 16 | 1.18" | ISO-KF | 10 -8 torr @ 72° F | 5/8" | Glass | 660° | 0000000 | 0000000 |
| 25 | 1.57" | ISO-KF | 10 -8 torr @ 72° F | 5/8" | Glass | 660° | 0000000 | 000000 |
| 40 | 2.16" | ISO-KF | 10 -8 torr @ 72° F | 1 1/4" | Glass | 660° | 0000000 | 000000 |
| 50 | 2.95" | ISO-KF | 10 -8 torr @ 72° F | 1 1/4" | Glass | 660° | 0000000 | 000000 |
| For High-Vacuum Flange Size | For Flange OD | For Tube OD | Material | Max. Vacuum | High Vacuum Connection Type | Each | |
| 10; 16 | 1.18" | 1/2"; 3/4" | Aluminum | 10 -8 torr @ 72° F | ISO-KF | 00000000 | 00000 |
| 25 | 1.57" | 1" | Aluminum | 10 -8 torr @ 72° F | ISO-KF | 0000000 | 00000 |
| 40 | 2.16" | 1 1/2" | Aluminum | 10 -8 torr @ 72° F | ISO-KF | 0000000 | 00000 |
| 50 | 2.95" | 2" | Aluminum | 10 -8 torr @ 72° F | ISO-KF | 0000000 | 00000 |
| For High-Vacuum Flange Size | For Flange OD | For Tube OD | Inner Ring Material | Max. Vacuum | High Vacuum Connection Type | Each | |
| 16 | 1.18" | 3/4" | 304 Stainless Steel | 10 -8 torr @ 72° F | ISO-KF | 00000000 | 00000 |
| 25 | 1.57" | 1" | 304 Stainless Steel | 10 -8 torr @ 72° F | ISO-KF | 0000000 | 00000 |
| 40 | 2.16" | 1 1/2" | 304 Stainless Steel | 10 -8 torr @ 72° F | ISO-KF | 0000000 | 00000 |
| 50 | 2.95" | 2" | 304 Stainless Steel | 10 -8 torr @ 72° F | ISO-KF | 0000000 | 00000 |
Flow Sights with Barbed Fittings for Water, Oil, Air, and Inert Gas
Monitor liquid movement, color, and clarity in tube systems—these sights have barbed fittings that slide into soft plastic and rubber tubing. They have a clear body and an indicator that moves when flow is present, so you can visually confirm flow from a distance.
Indicator | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Tube ID | Temp. Range, °F | End-to-End Lg. | Ht. | Max. Pressure | Direction of Flow | Material | Color | For Use With | Each | |
Ball Indicator | ||||||||||
Polycarbonate Plastic Body | ||||||||||
| 1/4" to 3/8" | 32° to 180° | 3" | 2 1/4" | 10 psi @ 70° F | Bottom to Top, Left to Right, Right to Left, Top to Bottom | Nylon Plastic | White | Water, Oil, Air, Inert Gas | 0000000 | 000000 |
Rotor Indicator | ||||||||||
Polymethylpentene Plastic Body | ||||||||||
| 1/4" to 7/16" | 32° to 140° | 3 1/2" | 1 9/16" | 20 psi @ 70° F | Bottom to Top, Left to Right, Right to Left, Top to Bottom | Polypropylene Plastic | Blue | Water, Mineral Oil, Air, Inert Gas | 0000000 | 00000 |
Polystyrene Plastic Body | ||||||||||
| 3/16" to 1/4" | 0° to 190° | 2" | 1" | 10 psi @ 70° F | Bottom to Top, Left to Right, Right to Left, Top to Bottom | Polystyrene Plastic | Blue | Water, Oil, Air, Inert Gas | 0000000 | 00000 |