Inert Gas Drains | McMaster-Carr

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12 Products

Drain Valves

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

Thumb-Screw Handle—Inline

Valves with a thumb-screw handle open by rolling the slip-resistant thumb screw between your fingers. Since these valves don’t have a wide handle, they fit in tighter spaces than valves with other handle styles.

Inline handles can be operated from any position. The handle surrounds the drain outlet, so liquids may splash onto your hands or the handle.

External Seal—Valves with an external seal are for higher flow applications than valves with an internal seal. They also have a longer valve stem, so they’re less likely to introduce contaminants from exposed threads.

Brass Handle—Brass handles won’t corrode.

Brass Body—Valves with a brass body won’t corrode when venting air or draining water—even in wet or humid environments.

	Inlet
	Pipe Size	Thread Type	Gender	Outlet Connection Port	Handle Material	Body Material	For Use With	Max. Pressure @ Temp.	Temp. Range, ° F	Ht.		Each
Straight—External Seal



		1/8	NPT	Male	Drain	Brass	Brass	Air, Water, Inert Gas	100 psi @ 250° F	-65 to 250	3/4"	4921K91	00000

Wing Nut Handle—Inline (Wing Facing Inlet)

Image of Product. Front orientation. Drain Valves. Drain Valves, Wing Facing Inlet, Wing Nut Handle, Inline Handle.

Valves with a wing nut handle give you leverage to open tight, stubborn valves that have been sealed for long periods of time. The wings on these handles face inward, so they have a lower profile than handles with outlet-facing wing nuts.

Inline handles can be operated from any position. The handle surrounds the drain outlet, so liquids may splash onto your hands or the handle.

Brass Body—Valves with a brass body won’t corrode when venting air or draining water—even in wet or humid environments.

	Inlet
	Pipe Size	Thread Type	Gender	Outlet Connection Port	Handle Material	Body Material	For Use With	Max. Pressure @ Temp.	Temp. Range, ° F	Ht.		Each
Straight—External Seal



		1/8	NPT	Male	Drain	Steel	Brass	Air, Water, Oil, Inert Gas	150 psi @ 250° F	-65 to 250	7/8"	4921K86	00000


		3/8	NPT	Male	Drain	Steel	Brass	Air, Water, Oil, Inert Gas	150 psi @ 250° F	-65 to 250	1 1/4"	4921K89	0000

Wing Nut Handle—Inline (Wing Facing Outlet)

Image of Product. Bottom orientation. Drain Valves. Drain Valves, Wing Nut Handle, Wing Facing Outlet, Inline Handle.

Inline handles can be operated from any position. The handle surrounds the drain outlet, so liquids may splash onto your hands or the handle.

Spout—A spout outlet smoothly pours any draining liquid into buckets without splashing.

Brass Body—Valves with a brass body won’t corrode when venting air or draining water—even in wet or humid environments.

	Inlet
	Pipe Size	Thread Type	Gender	Outlet Connection Port	Handle Material	Body Material	For Use With	Max. Pressure @ Temp.	Temp. Range, ° F	Ht.		Each
Straight—External Seal



		1/4	NPT	Male	Drain	Steel	Brass	Air, Water, Oil, Inert Gas	150 psi @ 250° F	-65 to 250	1"	4921K87	00000


		1/4	NPT	Male	Spout	Steel	Brass	Air, Water, Oil, Inert Gas	150 psi @ 250° F	-65 to 250	1 1/2"	4921K88	0000

Wing Nut Handle—Side (Wing Facing Inlet)

Image of Product. Bottom orientation. Drain Valves. Drain Valves, Wing Nut Handle, Side Handle, Wing Facing Inlet.

Side handles are out of the way of the flow, so your hand and the handle stay dry.

Spout—A spout outlet smoothly pours any draining liquid into buckets without splashing.

Brass Body—Valves with a brass body won’t corrode when venting air or draining water—even in wet or humid environments.

	Inlet
	Pipe Size	Thread Type	Gender	Outlet Connection Port	Handle Material	Body Material	For Use With	Max. Pressure @ Temp.	Temp. Range, ° F	Port-to-Port Lg.		Each
90° Elbow—External Seal



		1/4	NPT	Male	Spout	Steel	Brass	Air, Water, Oil, Inert Gas	150 psi @ 250° F	-65 to 250	11/16"	4921K85	00000

T-Handle—Inline

Inline handles can be operated from any position. The handle surrounds the drain outlet, so liquids may splash onto your hands or the handle.

Valves with a T-handle have two flat arms that provide more leverage and torque than thumb-screw handles and are more comfortable to grip than wing-nut handles. They have a removable handle, which can be disassembled for cleaning.

Internal Seal—Valves with an internal seal have shorter stems than those with external seals, so they fit shorter clearances. However, they’re more likely to introduce contaminants to the tank from debris collected on the exposed threads.

Brass Handle—Brass handles won’t corrode.

Brass Body—Valves with a brass body won’t corrode when venting air or draining water—even in wet or humid environments.

	Inlet
	Pipe Size	Thread Type	Gender	Outlet Connection Port	Handle Material	Body Material	For Use With	Features	Max. Pressure @ Temp.	Temp. Range, ° F	Ht.		Each
Straight—Internal Seal



		1/8	NPT	Male	Drain	Brass	Brass	Water, Oil, Inert Gas	Removable Handle	150 psi @ 250° F	-65 to 250	1 9/16"	4921K1	000000


		1/4	NPT	Male	Drain	Brass	Brass	Water, Oil, Inert Gas	Removable Handle	150 psi @ 250° F	-65 to 250	1 11/16"	4921K2	00000
		3/8	NPT	Male	Drain	Brass	Brass	Water, Oil, Inert Gas	Removable Handle	150 psi @ 250° F	-65 to 250	1 13/16"	4921K3	00000

Float Valves for Draining Condensate


Straight Valve Body With Drain Plug	Straight Valve Body With Drain Plug And Top Vent

Automatically remove condensate from compressed air or inert gas lines—these float valves have a float-operated drain control. Install them as a condensate trap after the separator in your system.

	Inlet			Outlet			Drain					Overall
	Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Flow Cap. @ Temp.	Max. Pressure, psi	Ht.	Wd.	Specs. Met	Valve Body Material	Seal Material	Temp. Range, ° F		Each
Cast Iron Housing







				Straight Valve Body with Drain Plug

				3/4	NPT	Female	3/4	NPT	Female	3/8	NPT	Female	1,750 lb/hr @ 70° F	250	5 1/4"	6 3/4"	ASTM A48 Class 30	303 Stainless Steel	Buna-N	35 to 450	4915K3	0000000




						Straight Valve Body with Drain Plug and Top Vent

						1/2	NPT	Female	1/2	NPT	Female	1/4	NPT	Female	600 lb/hr @ 70° F	250	6 11/16"	5 5/8"	ASTM A48 Class 30	420 Stainless Steel	Carbon Steel	35 to 450	4915K2	000000


						3/4	NPT	Female	3/4	NPT	Female	1/4	NPT	Female	600 lb/hr @ 70° F	250	6 11/16"	5 5/8"	ASTM A48 Class 30	420 Stainless Steel	Carbon Steel	35 to 450	4915K5	000000