Threaded Union Valves | McMaster-Carr

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175 Products

About On/Off Valves

Easy-to-Install Threaded On/Off Valves

For fast installation and removal from pipelines, these valves have a union fitting that disassembles into multiple pieces. They’re for use with water, oil, air, inert gas, and steam.

Easy-to-Install Plastic Threaded On/Off Valves

These valves have union fittings that disassemble for fast installation and removal from pipelines. Use with water, air, and inert gas.

Easy-to-Install Plastic Threaded
On/Off Valves for Drinking Water

Disassemble the union fittings on these valves for fast installation and removal from your pipeline. All meet NSF/ANSI 61 for use with drinking water.

Easy-to-Install Threaded
On/Off Valves for Chemicals

For fast installation and removal from pipelines, these valves have union fittings that disassemble into multiple pieces. All have a fluoroelastomer seal and a plastic body that can stand up to aggressive and corrosive solutions in chemical-processing applications.

Easy-to-Install Plastic Threaded
Flow-Adjustment Valves

Save time on installation—just slide the included union fittings onto your pipe and thread these valves into the fittings. When it’s time to clean or maintain your line, unthread the valves from the fittings. Ideal for metering, sampling, and other applications, these valves gradually open and close to adjust flow as you turn the handle.

Easy-to-Install Threaded Diverting Valves

For easy installation and removal from pipelines, all ends on these valves have union fittings that disassemble into multiple pieces. Use with water. Valves divert flow between ports.

Easy-to-Install Threaded
Diverting Valves for Chemicals

For easy installation and removal from pipelines, all ends on these valves have union fittings that disassemble into multiple pieces. Their fluoroelastomer seal and plastic body can withstand aggressive and corrosive solutions for diverting flow between ports in chemical-processing applications.

Diverting Valves for Drinking Water

To divert flow between ports in drinking water lines, these valves meet NSF/ANSI 61.

Easy-to-Install Threaded Check
Valves for Harsh Chemicals

To reduce installation time and allow for maintenance without detaching pipe connections, these valves have union fittings.