Brass Stop Cocks | McMaster-Carr

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69 Products

On/Off Valves with Quick-Turn Fittings

Also known as luer-lock couplings, quick-turn fittings consist of a plug and a socket that connect with a half turn, so you can easily connect and disconnect your line.

Nickel-plated brass valves are more corrosion resistant and durable than polycarbonate valves, however they are heavier and more expensive.

For technical drawings and 3-D models, click on a part number.

Nickel-Plated Brass Body with Lever Handle

Quick-Turn Female × Barbed

Quick-Turn Female × Quick-Turn Male

Quick-Turn Male × Quick-Turn Male

Valve Type: Stop Cock
For Use With: Oil, Water

Quick-Turn Female × Barbed
Max. Pressure	End-to-End Lg.		Each
45 psi @ 70° F	1 1/4"	0000000	0000000
Quick-Turn Female × Quick-Turn Male
45 psi @ 70° F	1 3/8"	0000000	000000
Quick-Turn Male × Quick-Turn Male
45 psi @ 70° F	1 5/8"	0000000	000000

Compact Threaded On/Off Valves

Install these low-profile valves in tight spots.

Short lever handles, T-handles, and screwdriver-operated handles resist accidental movement when snagged or bumped.

For technical drawings and 3-D models, click on a part number.

Brass Body with Lever Handle

Female × Female

Male × Female

Male × Male

Male × Drain

Male × Spout

Valve Type: Stop Cock
For Use With: Air
Seal Material: Brass

NPT Female × NPT Female
Pipe Size	Max. Pressure	Temperature Range, °F	End-to-End Lg.		Each
1/8	80 psi @ 500° F	35° to 500°	1 5/8"	00000000	000000
1/4	80 psi @ 500° F	35° to 500°	1 5/8"	00000000	00000
3/8	80 psi @ 500° F	35° to 500°	1 7/8"	00000000	00000
1/2	80 psi @ 500° F	35° to 500°	2"	00000000	00000
NPT Male × NPT Female
3/8	80 psi @ 500° F	35° to 500°	1 7/8"	00000000	00000
1/2	80 psi @ 500° F	35° to 500°	1 15/16"	00000000	00000
NPT Male × NPT Male
1/4	80 psi @ 500° F	35° to 500°	2 1/8"	00000000	00000
3/8	80 psi @ 500° F	35° to 500°	2 3/8"	00000000	00000
1/2	80 psi @ 500° F	35° to 500°	2 3/16"	00000000	00000
NPT Male × Drain
1/8	80 psi @ 500° F	35° to 500°	1 11/16"	00000000	00000
1/4	80 psi @ 500° F	35° to 500°	1 13/16"	00000000	00000
3/8	80 psi @ 500° F	35° to 500°	2"	00000000	00000
1/2	80 psi @ 500° F	35° to 500°	2"	00000000	00000
NPT Male × Spout
1/8	80 psi @ 500° F	35° to 500°	2 1/4"	00000000	00000
1/4	80 psi @ 500° F	35° to 500°	2 1/4"	00000000	00000
3/8	80 psi @ 500° F	35° to 500°	2 1/4"	00000000	00000
1/2	80 psi @ 500° F	35° to 500°	2 3/8"	00000000	00000

Brass Body with T-Handle

Female × Female

Male × Female

Male × Male

Male × Spout

Valve Type: Stop Cock
For Use With: Air
Seal Material: Brass

NPT Female × NPT Female
Pipe Size	Max. Pressure	Temperature Range, °F	End-to-End Lg.		Each
1/8	80 psi @ 500° F	35° to 500°	1 5/8"	00000000	000000
1/4	80 psi @ 500° F	35° to 500°	1 5/8"	00000000	00000
3/8	80 psi @ 500° F	35° to 500°	1 7/8"	00000000	00000
NPT Male × NPT Female
1/8	80 psi @ 500° F	35° to 500°	1 13/16"	00000000	00000
1/4	80 psi @ 500° F	35° to 500°	1 7/8"	00000000	00000
3/8	80 psi @ 500° F	35° to 500°	1 7/8"	00000000	00000
NPT Male × NPT Male
1/8	80 psi @ 500° F	35° to 500°	1 13/16"	00000000	00000
1/4	80 psi @ 500° F	35° to 500°	2 1/8"	00000000	00000
3/8	80 psi @ 500° F	35° to 500°	2 3/8"	00000000	00000
NPT Male × Spout
1/8	80 psi @ 500° F	35° to 500°	2 1/4"	00000000	00000
1/4	80 psi @ 500° F	35° to 500°	2 1/4"	00000000	00000

On/Off Valves with Compression Fittings

A compression sleeve bites into tubing as you tighten the nut, forming a strong seal.

Standard-port valves slightly restrict flow.

For technical drawings and 3-D models, click on a part number.

Compression × Compression

Valve Type:
Brass Seal: Plug
All Other Valves: Ball
For Use With: See table

Brass Body—Brass Seal
For Tube OD	Flow Coefficient (Cv)	Max. Pressure	Temperature Range, °F	Port Type	End-to-End Lg.	For Use With		Each
1/4"	Not Rated	30 psi @ 125° F	35° to 125°	Standard	2 3/8"	Water, Air	000000	000000
3/8"	Not Rated	30 psi @ 125° F	35° to 125°	Standard	2 7/16"	Water, Air	000000	00000

Compression × NPTF Male

Valve Type: Plug
For Use With: Air, Water

Brass Body—Brass Seal
For Tube OD	Pipe Size	Max. Pressure	Temperature Range, °F	Port Type	End-to-End Lg.		Each
1/4"	1/8	30 psi @ 125° F	35° to 125°	Standard	2 5/16"	000000	000000
1/4"	1/4	30 psi @ 125° F	35° to 125°	Standard	2 3/16"	000000	00000
3/8"	1/4	30 psi @ 125° F	35° to 125°	Standard	2 1/4"	000000	00000

Compact Threaded On/Off Valves for Fuel

Female × Female

Female × Male

Valve Type: Plug
For Use With: Diesel Fuel, Fuel Oil, Kerosene
Seal Material: Buna-N Rubber Body
Specifications Met: See table

A low-profile handle allows these valves to fit in low-clearance pipelines for diesel fuel, fuel oil, gasoline, and kerosene.

For technical drawings and 3-D models, click on a part number.

Brass Body
Pipe Size	Max. Pressure	Temperature Range, °F	End-to-End Lg.	Specifications Met		Each
NPTF Female × NPTF Female
1/4	15 psi @ 70° F	-30° to 250°	2 1/8"	UL Listed	0000000	000000
1/4	30 psi @ 70° F	-30° to 250°	2 1/8"	__	0000000	00000
NPTF Female × NPTF Male
1/8	30 psi @ 70° F	-30° to 250°	2"	__	0000000	00000
1/4	15 psi @ 70° F	-30° to 250°	2 1/4"	UL Listed	0000000	00000
1/4	30 psi @ 70° F	-30° to 250°	2 1/4"	__	0000000	00000
3/8	15 psi @ 70° F	-30° to 250°	2 7/16"	UL Listed	0000000	00000
3/8	30 psi @ 70° F	-30° to 250°	2 7/16"	__	0000000	00000

Drainage Valves

Thumb-Screw Handle

Wing-Nut Handle

Removable T-Handle

Flat Handle

Cable Pull

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

Valves with external seal are for higher flow applications than valves with an internal seal.

Valves with removable handle can be disassembled for cleaning.

Inlet			Outlet
Pipe Size	Thread Type	Gender	Connection Type	For Tube ID	Tube Connection Type	For Use With	Cable Lg., ft.	Features	Max. Pressure	Temp. Range, °F	Ht.	Wd.	Body Material		Each
Thumb-Screw Handle
External Seal
1/4	NPT	Male	Unthreaded Hole	__	__	Air	__	__	250 psi @ 250° F	-40° to 250°	1 1/8"	__	Brass	0000000	00000
Wing-Nut Handle
External Seal
1/8	NPT	Male	Tube	1/4"	Barbed	Water, Oil	__	__	150 psi @ 250° F	-65° to 250°	1 1/2"	__	Brass	0000000	0000
1/8	NPT	Male	Unthreaded Hole	__	__	Water, Oil	__	__	150 psi @ 250° F	-65° to 250°	15/16"	__	Brass	0000000	0000
1/4	NPT	Male	Tube	3/8"	Barbed	Water, Oil	__	__	150 psi @ 250° F	-65° to 250°	1 9/16"	__	Brass	0000000	0000
1/4	NPT	Male	Unthreaded Hole	__	__	Water, Oil	__	__	150 psi @ 250° F	-40° to 350°	1"	__	Brass	0000000	0000
3/8	NPT	Male	Unthreaded Hole	__	__	Water, Oil	__	__	150 psi @ 250° F	-65° to 250°	1 1/4"	__	Brass	0000000	0000
1/2	NPT	Male	Unthreaded Hole	__	__	Water, Oil	__	__	150 psi @ 250° F	-65° to 250°	1 1/2"	__	Brass	0000000	00000
Internal Seal
1/8	NPT	Male	Unthreaded Hole	__	__	Water, Oil	__	__	150 psi @ 250° F	-65° to 250°	1 5/16"	__	Brass	0000000	00000
1/4	NPT	Male	Unthreaded Hole	__	__	Water, Oil	__	__	150 psi @ 250° F	-65° to 250°	15/16"	__	Brass	0000000	0000
3/8	NPT	Male	Unthreaded Hole	__	__	Water, Oil	__	__	150 psi @ 250° F	-65° to 250°	1 1/4"	__	Brass	0000000	0000
T-Handle
Internal Seal
1/8	NPT	Male	Unthreaded Hole	__	__	Water, Oil, Inert Gas	__	Removable Handle	150 psi @ 250° F	-65° to 250°	1 9/16"	__	Brass	000000	00000
1/4	NPT	Male	Unthreaded Hole	__	__	Water, Oil	__	__	150 psi @ 250° F	-65° to 250°	1 3/4"	1 7/16"	Brass	0000000	00000
1/4	NPT	Male	Unthreaded Hole	__	__	Water, Oil, Inert Gas	__	Removable Handle	150 psi @ 250° F	-65° to 250°	1 11/16"	__	Brass	000000	00000
3/8	NPT	Male	Unthreaded Hole	__	__	Water, Oil, Inert Gas	__	Removable Handle	150 psi @ 250° F	-65° to 250°	1 13/16"	__	Brass	000000	00000
Cable Pull
Internal Seal
1/4	NPT	Male	Unthreaded Hole	__	__	Air	1 1/2	__	250 psi @ 250° F	-40° to 250°	1 1/4"	__	Brass	00000000	0000
1/4	NPT	Male	Unthreaded Hole	__	__	Air	3	__	250 psi @ 250° F	-40° to 250°	1 1/4"	__	Brass	00000000	0000
1/4	NPT	Male	Unthreaded Hole	__	__	Air	4	__	150 psi @ 250° F	-65° to 250°	1 7/8"	__	Brass	00000000	00000
1/4	NPT	Male	Unthreaded Hole	__	__	Air	5	__	250 psi @ 250° F	-40° to 250°	1 1/4"	__	Brass	00000000	0000

Easy-Grip Drainage Valves

The large knob makes these drainage valves easy to grip. They're also known as stop cocks.

For technical drawings and 3-D models, click on a part number.

Inlet			Outlet
Pipe Size	Thread Type	Gender	Connection Type	Gender	For Use With	Max. Pressure	Temp. Range, °F	Port-to-Port Lg.	Body Material		Each
1/2	NPT	Male	Unthreaded Hole	Male	Water, Oil	250 psi @ 400° F	32° to 400°	1"	Brass	0000000	000000
3/4	NPT	Male	Unthreaded Hole	Male	Water, Oil	250 psi @ 400° F	32° to 400°	1"	Brass	000000	00000

Laboratory Valves

Styles A and B come with three interchangeable, color-coded identification buttons: orange for air, blue for gas, and yellow for vacuum.

For technical drawings and 3-D models, click on a part number.

	Valve				Max.			Inlet
Style	Function	Type	Lg.	Ht.	Air Pressure, psi	Vacuum, in. of Hg	Gas Pressure, psi	Pipe Size	Thread Type	Gender	Outlet Hose Connection Type	For Hose ID		Each
For Air and Gas
Chrome-Plated Brass
A	On/Off	Stop Cock	3 7/8"	1 1/2"	125	30	0.5	3/8	NPT	Male	Barbed	1/4"-3/8"	0000000	000000

Laboratory Flanges and Turrets

Provide a connection for stop cocks, needle valves, and nozzles by attaching these flanges and turrets to your supply pipe.

					Inlet			Outlet
	No. of Outlets	Outlet Angle	Dia.	Ht.	Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender		Each
For Air, Gas, and Water
Chrome-Plated Brass
A	1	__	2"	1 1/8"	3/8	NPT	Female	3/8	NPT	Female	0000000	000000
B	2	__	1 7/8"	1 1/2"	3/8	NPT	Female	3/8	NPT	Female	0000000	00000
C	1	__	2"	2"	3/8	NPT	Female	3/8	NPT	Female	0000000	00000
D	2	90°	2"	2"	3/8	NPT	Female	3/8	NPT	Female	0000000	00000
E	2	180°	2"	2"	3/8	NPT	Female	3/8	NPT	Female	0000000	00000