Drain Float Valves | McMaster-Carr

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14 Products

Clear-View Float-Actuated Compressed Air Drain Valves


Nylon Bowl	Polycarbonate Bowl

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. Also known as drip legs, these have a float that automatically opens the drain when the bowl begins to fill. Install them at low points in your line after separators, dryers, filters, and aftercoolers. Drains can be serviced without removing them from your air line.

	Drain Valves																Replacement Bowls
	Inlet			Outlet							Overall
	Pipe Size	Thread Type	Gender	Connection	For Tube ID, mm	Pipe Size	Thread Type	Gender	Discharge Cap., gpm	Max. Pressure, psi	Ht.	Wd.	Dp.	Max. Temp., ° F		Each		Each
Polycarbonate Bowl—Clear



		1/4	NPT	Female	Threaded	—	3/8	NPT	Female	Not Rated	145	7 1/8"	3 1/8"	3 1/8"	140	0000000	000000	0000000	000000


		3/8	NPT	Female	Threaded	—	3/8	NPT	Female	Not Rated	145	7 1/8"	3 1/8"	3 1/8"	140	0000000	00000	0000000	00000


		Nylon Bowl—Clear



				1/2	NPT	Female	Barbed	6	—	—	Male	1.2	145	6 5/8"	2 3/8"	2 3/8"	122	0000000	000000	0000000	00000

High-Pressure Float-Actuated Compressed Air Drain Valves

Able to withstand up to 400 psi, these have the highest pressure rating of all our float-operated drain valves. Also known as drip legs, these drain valves have a float that automatically opens the drain when the bowl begins to fill. Install them at low points in your line after separators, dryers, filters, and aftercoolers.

	Inlet			Outlet						Overall
	Pipe Size	Thread Type	Gender	Connection	Pipe Size	Thread Type	Gender	Discharge Cap., gpm	Max. Pressure, psi	Ht.	Wd.	Dp.	Max. Temp., ° F		Each
Stainless Steel Bowl—Opaque



		1/2	NPT	Female	Threaded	1/2	NPT	Female	2.2	400	7 1/2"	2 5/8"	2 5/8"	500	0000000	0000000

Compact Float-Actuated Compressed Air Drain Valves

Sized right for tight spots. Also known as drip legs, these drain valves have a float that automatically opens the drain when the bowl begins to fill. Install them at low points in your line after separators, dryers, filters, and aftercoolers. Drains can be serviced without removing them from your air line.

	Inlet			Outlet						Overall
	Pipe Size	Thread Type	Gender	Connection	Pipe Size	Thread Type	Gender	Discharge Cap., gpm	Max. Pressure, psi	Ht.	Wd.	Dp.	Max. Temp., ° F		Each
Aluminum Bowl—Opaque



		1/4	NPT	Female	Threaded	1/8	NPT	Female	0.7	250	3 1/4"	2 1/2"	2 1/2"	175	00000000	0000000


		1/2	NPT	Female	Threaded	1/8	NPT	Female	0.7	250	3 1/4"	2 1/2"	2 1/2"	175	00000000	000000

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	000000	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	000000	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	000000	000000

Easy-Clean Float-Actuated Compressed Air Drain Valves

An external drain provides quick, easy access for cleaning. Also known as drip legs, these drain valves have a float that automatically opens the drain when the bowl begins to fill. Install them at low points in your line after separators, dryers, filters, and aftercoolers. Drains can be serviced without removing them from your air line.

	Inlet			Outlet						Overall
	Pipe Size	Thread Type	Gender	Connection	Pipe Size	Thread Type	Gender	Discharge Cap.	Max. Pressure, psi	Ht.	Wd.	Dp.	Drain Material	Max. Temp., ° F		Each
Polycarbonate Bowl—Opaque



		1/2	NPT	Female	Threaded	1/4	NPT	Female	Not Rated	150	7 3/4"	3 3/4"	3 3/4"	Bronze	120	0000000	0000000

High-Discharge Float-Actuated Compressed Air Drain Valves

With a discharge capacity of more than four gallons per minute, these drain valves can handle large compressed air systems. Also known as drip legs, these drain valves have a float that automatically opens the drain when the bowl begins to fill. Install them at low points in your line after separators, dryers, filters, and aftercoolers. Drains can be serviced without removing them from your air line.

	Inlet			Outlet						Overall
	Pipe Size	Thread Type	Gender	Connection	Pipe Size	Thread Type	Gender	Discharge Cap., gpm	Max. Pressure, psi	Ht.	Wd.	Dp.	Max. Temp., ° F		Each
Aluminum Bowl—Opaque



		1	NPT	Female	Threaded	1/16	NPT	Female	4.2	300	6 3/4"	5 1/4"	10 3/8"	300	0000000	0000000


		1	NPT	Female	Threaded	1/8	NPT	Female	4.2	150	6 3/4"	5 1/4"	10 3/8"	300	0000000	000000