Backwater Valves | McMaster-Carr

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System of Measurement

Pipe Size

Body Material

Stainless Steel

Fitting Connection

Push to Connect

For Use With

Flammable Vapors

Chlorinated Water

Deionized Water

Thread Type

UN/UNF (SAE Straight)

Minimum Opening Pressure

Connects To

Gender

Maximum Pressure @ Temperature

50 psi @ 65° F

10 psi @ 70° F

15 psi @ 70° F

25 psi @ 70° F

50 psi @ 70° F

115 psi @ 70° F

125 psi @ 70° F

145 psi @ 70° F

150 psi @ 70° F

200 psi @ 70° F

220 psi @ 70° F

275 psi @ 70° F

300 psi @ 70° F

400 psi @ 70° F

500 psi @ 70° F

600 psi @ 70° F

720 psi @ 70° F

1,000 psi @ 70° F

Mounting Position

Check Valve Type

Spring-Loaded Ball

Spring-Loaded Piston

Tube OD

Actuation

Valve Type

Reduced Pressure Zone

Shape

Seal Material

Stainless Steel

Tube ID

Maximum Temperature

Less than 200° F

200° F to 249° F

250° F to 299° F

300° F to 499° F

500° F or greater

End-to-End Length

Material

Stainless Steel

Fitting Type

RoHS

Compliant with Exemptions

REACH

DFARS Specialty Metals

Export Control Classification Number (ECCN)

How can we improve?

994 Products

Fluid Handling

Check Valves

Permit flow in only one direction by closing when flow stops or reverses

Sump Pump Backflow-Prevention Valves

Sump Pump Backflow-Prevention Valves

Block dirty water from returning to your sump pump

Backflow-Prevention Valves

Backflow-Prevention Valves

Dual checks stop flow from reversing and contaminating your system

Vacuum Breakers

Vacuum Breakers

When pressure drops, vents open to prevent suction from drawing liquid back upstream

Flow-Adjustment Valves

Flow-Adjustment Valves

Gradually open and close to control the volume of air and liquids through a line

Flame Arresters

Flame Arresters

Absorb heat from a fire in your gas pipeline to stop it from traveling back to the gas source

Facility and Grounds Maintenance

Drain Check Valves

Drain Check Valves

Prevent water damage by placing into floor drains to stop sewer back-ups

Fastening and Joining

Welding Gas Flashback Arresters

Welding Gas Flashback Arresters

Attach to your gas welder to extinguish flames and stop reverse gas flow

Power Transmission

Hydraulic Check Valves

Hydraulic Check Valves

Open to allow hydraulic fluid flow in one direction and close when flow stops or reverses

Air Flow Check Valves

Air Flow Check Valves

Open to allow air flow in one direction and close when flow stops or reverses

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)