NPT Drain Valves | McMaster-Carr

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339 Products

About Pressure-Relief Valves

Drain Valves

Also known as stop cocks, install these valves on your tank for easy draining of air or fluid.

High-Temperature Drain Valves

Empty fluid from tanks in boiler rooms or heat transfer systems—these valves withstand higher temperatures than our other drain valves. Also known as stop cocks.

Float Valves for Draining Condensate

Automatically remove condensate from compressed air or inert gas lines—these float valves have a float-operated drain control.

Compact Float Valves for Food and Beverage

Smaller than other float valves, these are sized for containers with limited space.

Extra-Compact Plastic Float Valves

Control water levels in spaces where a rod and lever won’t fit; these float valves have an internal float and connect to your pipe.

Compact Metal Float Valves

Smaller than other float valves, these are sized for containers with limited space.

Compact Plastic Float Valves

Smaller than other float valves, these are sized for containers with limited space.

Brass Float Valves

Use these float valves with water.

Polypropylene Float Valves

Able to withstand higher temperatures than PVC float valves, these valves have a temperature range of 35° to 175° F.

PVC Float Valves

These float valves have a temperature range of 35° to 110° F.

Float Valve Bodies for Water

Combine these float valve bodies with floats and rods to create float valves that meet exact specifications.

Compressed Air Drain Valves

Timer-Operated Compressed Air Drain Valves

Set the electronic timer on these drain valves to open automatically at your specified time interval.

High-Pressure Timer-Operated
Compressed Air Drain Valves

These withstand at least double the pressure of our other timer-operated drain valves.

Timer-Operated Compressed Air
Drain Valves with Digital Display

Use the digital display to set these valves to open automatically at precise intervals.

High-Pressure Float-Operated
Compressed Air Drain Valves

Able to withstand up to 400 psi, these have the highest pressure rating of all our float-operated drain valves.

Easy-to-Monitor Float-Operated
Compressed Air Drain Valves

Keep an eye on condensate collecting in your compressed air line. These drain valves have a clear bowl, so you can see inside to inspect the contents.

Compact Float-Operated
Compressed Air Drain Valves

Sized right for tight spots.

Easy-to-Clean Float-Operated
Compressed Air Drain Valves

An external drain provides quick, easy access for cleaning.

High-Discharge Float-Operated
Compressed Air Drain Valves

With a discharge capacity of more than four gallons per minute, these drain valves can handle large compressed air systems.

Back-Pressure-Operated
Compressed Air Drain Valves

When your compressor turns off, it creates back pressure that opens these valves automatically, allowing liquid to escape.

No-Air-Loss Compressed Air Drain Valves

Save energy by minimizing the loss of compressed air. Unlike other drain valves, these only open when they’re full. They close before the reservoir is completely empty, so no air escapes from the system.