Dessicant Filters | McMaster-Carr

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Opaque with Sight Glass

Outlet Pipe Size

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Removes Particle Size Down To

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72 Products

Moisture Absorbing Breather Vents

Keep moisture, dirt, and debris from entering your oil reservoirs. The silica gel inside these breather vents absorbs moisture from the air, preventing rust from forming inside your tanks. The gel changes from blue to pink as it becomes saturated, letting you know it needs to be replaced. A second filter blocks dust and other particles from getting inside. These breather vents allow air to flow in and out of your lubrication system, keeping excess vacuum or pressure from building up in cylinders, gear boxes, and tanks.

Nylon and Polycarbonate Body—NPT Male

Breather vents with a plastic body are clear, so a quick glance will tell you if the gel is saturated. Unlike steel versions, which can be rebuilt, the entire unit must be replaced when fresh gel is needed.

	For Tank Cap., gal.	Max. Flow Rate @ Pressure	Max. Temp., ° F	Ht.	Dia.	For Use With	Removes Particle Size Down To, μm		Each
Nylon and Polycarbonate Body with Nylon Fitting



	3/8	1 to 2	4.5 scfm @ 1 psi	200	4"	2 1/2"	Air, Inert Gas	3	3297T72	000000


	3/8	1 to 5	4 scfm @ 1 psi	200	5 3/8"	2 1/2"	Air, Inert Gas	3	3297T71	00000
	1	5 to 200	16 scfm @ 1 psi	200	6 1/8"	4 1/8"	Air, Inert Gas	3	3297T31	00000
	1	5 to 350	16 scfm @ 1 psi	200	8 1/8"	4 1/8"	Air, Inert Gas	3	3297T33	000000
	1	5 to 500	16 scfm @ 1 psi	200	10 1/8"	4 1/8"	Air, Inert Gas	3	3297T35	000000

Nylon and Polycarbonate Body with Check Valves—NPT Female

Image of Product. Front orientation. Contains Inset. Breather Vents. Moisture Absorbing Breather Vents, NPT Thread, Polycarbonate Body, Nylon Body, Female.

For washdown environments, select breather vents with check valves. These valves allow air to flow in and out, but close when liquids try to enter.

	For Tank Cap., gal.	Max. Flow Rate @ Pressure	Max. Temp., ° F	Ht.	Dia.	For Use With	Removes Particle Size Down To, μm		Each
Nylon and Polycarbonate Body with Nylon Fitting



	1	1 to 400	27 scfm @ 1 psi	200	4 11/16"	5 11/16"	Air, Inert Gas	3	3297T73	0000000


	1	1 to 600	26 scfm @ 1 psi	200	6 7/16"	5 11/16"	Air, Inert Gas	3	3297T74	000000
	1	1 to 800	25 scfm @ 1 psi	200	8 1/4"	5 11/16"	Air, Inert Gas	3	3297T75	000000
	1	1 to 1,000	24 scfm @ 1 psi	200	10"	5 11/16"	Air, Inert Gas	3	3297T76	000000

Steel Body—NPT Male


	Repair Kits

For an extended service life, use breather vents with a steel body. They are stronger than breather vents with plastic bodies and hold up better when exposed to chemicals. A window lets you check the color of the gel.

Repair Kits—No need to replace the entire unit when the gel is saturated—use rebuild kits to add fresh gel and to replace the window, filters, and gaskets.

	Vents										Repair Kits
	Pipe Size	For Tank Cap., gal.	Max. Flow Rate @ Pressure	Max. Temp., ° F	Ht.	Dia.	For Use With	Removes Particle Size Down To, μm		Each		Each
Steel Body



		2	1 to 800	85 scfm @ 1 psi	220	11 1/2"	10 1/8"	Air	1	3297T77	000000000	3297T771	0000000


		2	1 to 1,300	85 scfm @ 1 psi	220	13 3/4"	10 1/8"	Air	1	3297T78	00000000	3297T781	000000
		2	1 to 2,400	80 scfm @ 1 psi	220	18 1/4"	10 1/8"	Air	1	3297T79	00000000	3297T791	000000
		3	1 to 4,000	205 scfm @ 1 psi	220	19 1/4"	15 1/2"	Air	1	3297T81	00000000	3297T811	000000

Desiccant Compressed Air Dryers with Filters for Oil and Particle Removal


Style A	Style B	Style C

Style D	Style E

Prevent damage to air-powered tools and equipment—these dryers remove water, compressor oil, and particles from your air supply. The dryer and oil filter share the same cartridge to save space and reduce downtime when changing them. No need to mess with desiccant beads. Install them after separators and aftercoolers, which remove the bulk of the moisture.

When selecting a dryer, keep in mind that the larger the desiccant capacity, the longer they last between cartridge changes.

Opaque Bowl with Sight Glass—Dryers with an opaque bowl have a sight glass, so you can monitor contents. Their twist-on design allows for fast, clean, tool-free maintenance.

Clear Bowl—Dryers with a clear bowl are visible from all angles. They have a silica gel desiccant that changes from blue to pink, making it easy to know when to replace the cartridge. Disassembly is required to access the desiccant.

Air Dryers/Filters/Regulators—Dryers with a regulator monitor and adjust the flow of air.

Shutoff Valve—Dryers with a shut-off valve stop airflow when not in use to extend the life of the desiccant.

Styles A-D—Styles A-D have a particle filter before the dryer to remove large particles and protect the desiccant to extend its useful life.

Style E—Style E filter fine particles in the same cartridge as the dryer and oil filter. Install them vertically in your compressed air line so any water vapor collecting drains properly.

	Dryers																				Replacement Desiccants
		Inlet		Outlet											Overall
	Style	Pipe Size	Thread Type	Pipe Size	Thread Type	Max. Flow Rate @ Pressure	Desiccant Capacity	Removes Particle Size Down To, μm	Removes Oil Content Down To, ppm	Dew Point, ° F	Pressure Regulation Range, psi	Max. Pressure, psi	Max. Temp., ° F	Housing Material	Ht.	Wd.	Dp.	Gauge Included		Each		Each
Polycarbonate Bowl—Opaque with Sight Glass







				Air Dryer/Filter with Shutoff Valve

				A	1/2	NPT Female	1/2	NPT Female	30 scfm @ 120 psi	1 qt.	5	0.002	-30	—	120	120	Aluminum	16"	10 3/4"	5 1/8"	No	3018N111	0000000	3018N122	000000


				A	1/2	NPT Female	1/2	NPT Female	30 scfm @ 120 psi	1 qt.	40	0.002	-30	—	120	120	Aluminum	16"	10 3/4"	5 1/8"	No	3018N115	000000	3018N122	00000
				A	1/2	NPT Female	1/2	NPT Female	40 scfm @ 120 psi	1.5 qt.	5	0.002	-30	—	120	120	Aluminum	23 1/2"	10 3/4"	5 1/8"	No	3018N112	000000	3018N123	00000
				A	1/2	NPT Female	1/2	NPT Female	40 scfm @ 120 psi	1.5 qt.	40	0.002	-30	—	120	120	Aluminum	23 1/2"	10 3/4"	5 1/8"	No	3018N116	000000	3018N123	00000




						Air Dryer/Filter/Regulator with Shutoff Valve

						B	1/2	NPT Female	1/2	NPT Female	30 scfm @ 120 psi	1 qt.	5	0.002	-30	5 to 120	120	120	Aluminum	16"	14 1/4"	5 1/8"	Yes	3018N124	000000	3018N122	00000


						B	1/2	NPT Female	1/2	NPT Female	30 scfm @ 120 psi	1 qt.	40	0.002	-30	5 to 120	120	120	Aluminum	16"	14 1/4"	5 1/8"	Yes	3018N113	000000	3018N122	00000
						B	1/2	NPT Female	1/2	NPT Female	40 scfm @ 120 psi	1.5 qt.	5	0.002	-30	5 to 120	120	120	Aluminum	23 1/2"	14 1/4"	5 1/8"	Yes	3018N125	000000	3018N123	00000
						B	1/2	NPT Female	1/2	NPT Female	40 scfm @ 120 psi	1.5 qt.	40	0.002	-30	5 to 120	120	120	Aluminum	23 1/2"	14 1/4"	5 1/8"	Yes	3018N114	000000	3018N123	00000


						Polycarbonate Bowl—Clear







										Air Dryer/Filter with Shutoff Valve

										C	1/2	NPT Female	1/2	NPT Female	30 scfm @ 120 psi	1 qt.	5	0.002	-30	—	120	120	Aluminum	16"	10"	4"	No	3018N117	000000	3018N13	00000


										C	1/2	NPT Female	1/2	NPT Female	30 scfm @ 120 psi	1 qt.	40	0.002	-30	—	120	120	Aluminum	16"	10"	4"	No	3018N15	000000	3018N13	00000
										C	1/2	NPT Female	1/2	NPT Female	40 scfm @ 120 psi	2 qt.	5	0.002	-30	—	120	120	Aluminum	23 1/2"	10"	4"	No	3018N118	000000	3018N14	000000
										C	1/2	NPT Female	1/2	NPT Female	40 scfm @ 120 psi	2 qt.	40	0.002	-30	—	120	120	Aluminum	23 1/2"	10"	4"	No	3018N16	000000	3018N14	000000




												Air Dryer/Filter/Regulator with Shutoff Valve

												D	1/2	NPT Female	1/2	NPT Female	30 scfm @ 120 psi	1 qt.	5	0.002	-30	5 to 120	120	120	Aluminum	16"	13 1/2"	4"	Yes	3018N119	000000	3018N13	00000


												D	1/2	NPT Female	1/2	NPT Female	30 scfm @ 120 psi	1 qt.	40	0.002	-30	5 to 120	120	120	Aluminum	16"	13 1/2"	4"	Yes	3018N17	000000	3018N13	00000
												D	1/2	NPT Female	1/2	NPT Female	40 scfm @ 120 psi	2 qt.	5	0.002	-30	5 to 120	120	120	Aluminum	23 1/2"	13 1/2"	4"	Yes	3018N121	000000	3018N14	000000
												D	1/2	NPT Female	1/2	NPT Female	40 scfm @ 120 psi	2 qt.	40	0.002	-30	5 to 120	120	120	Aluminum	23 1/2"	13 1/2"	4"	Yes	3018N18	000000	3018N14	000000


												Acrylic Plastic Bowl—Clear







														Air Dryer/Filter

		E												1/2	NPT Female	1/2	NPT Female	20 scfm @ 100 psi	1/2 lb.	0.3	Not Rated	-40	—	150	150	Aluminum	11 7/8"	4 3/8"	4 3/8"	No	4437K12	000000	4437K51	00000


		E	1											NPT Female	1	NPT Female	60 scfm @ 100 psi	2 lb.	0.3	Not Rated	-40	—	150	150	Aluminum	19 3/4"	6 1/2"	6 1/2"	No	4437K13	00000000	4437K52	00000
		E	1 1/2											NPT Female	1 1/2	NPT Female	100 scfm @ 100 psi	6 lb.	0.3	Not Rated	-40	—	150	150	Aluminum	21 3/4"	8"	8"	No	4437K15	00000000	4437K55	00000
		E	2											NPT Female	2	NPT Female	200 scfm @ 100 psi	7 1/2 lb.	0.3	Not Rated	-40	—	150	150	Aluminum	19 1/8"	9 1/2"	9 1/2"	No	4437K16	00000000	4437K56	00000

Disposable Desiccant Compressed Air Dryers with Filters for Particle Removal

Install these dryers just before air-powered tools as final protection from water and particles and throw them away when you’re done. They have a clear bowl so you can see inside to monitor the desiccant. When the desiccant becomes saturated, it changes color to indicate that the dryer should be changed.

	Inlet		Outlet								Overall
	Pipe Size	Thread Type	Pipe Size	Thread Type	Max. Flow Rate @ Dew Point Temp.	Max. Flow Rate @ Pressure	Dew Point, ° F	Max. Pressure, psi	Max. Temp., ° F	Removes Particle Size Down To, μm	Dia.	Ht.	Desiccant Included		Each
Polycarbonate Housing







				Polycarbonate Bowl—Clear

				1/4	NPT Female	1/4	NPT Male	15 scfm @ -30° F	20 scfm @ 100 psi	-30	125	130	40	1 3/4"	3 3/4"	Yes	7793T1	000000

Disposable Desiccant Compressed Air Dryers with Filters for Oil and Particle Removal

Image of Product. Front orientation. Compressed Air Dryers. Disposable Desiccant Compressed Air Dryers with Filters for Oil and Particle Removal.

Use these dryers with filters to protect air-powered tools from water, oil, oil vapor, and particles, then throw them away when you're done. They have a polyurethane housing that has excellent resistance to synthetic compressor lubricants, solvents, acids, and chemicals. The bowl is clear so you can monitor the desiccant. When it becomes saturated, it changes color to indicate it should be replaced. Install in your air line just before the tool you want to protect.

	Inlet		Outlet								Overall
	Pipe Size	Thread Type	Pipe Size	Thread Type	Max. Flow Rate @ Pressure	Dew Point, ° F	Max. Pressure, psi	Max. Temp., ° F	Dew Point Temp. Reduction Rate	Removes Particle Size Down To, μm	Dia.	Ht.	Desiccant Included		Each
Polyurethane Rubber Housing







				Polyurethane Rubber Bowl—Clear

				1/4	NPT Female	1/4	NPT Female	5 scfm @ 100 psi	-40	250	180	20%	0.3	2 7/8"	4 1/2"	Yes	5164K77	0000000

Desiccant Compressed Air Dryers with Filters for Oil Removal


Opaque Bowl	Clear Bowl

Remove water and compressor oil from your air line to prevent damage to air-powered tools and equipment. The dryer and filter share the same cartridge to save space and reduce downtime when changing them. Install them after separators and aftercoolers to remove the bulk of the moisture, and after a particle filter to protect the desiccant.

Opaque Bowl—Dryers with an opaque bowl have a twist-on design for fast, clean, tool-free maintenance.

Clear Bowl—Dryers with a clear bowl are visible from all angles. They have silica gel desiccant that changes from blue to pink, making it easy to know when to replace the cartridge. Disassembly is required to access the desiccant.

	Dryers																			Replacement Desiccants
	Inlet		Outlet											Overall
	Pipe Size	Thread Type	Pipe Size	Thread Type	Max. Flow Rate @ Pressure	Desiccant Capacity, qt.	Dew Point, ° F	Max. Pressure, psi	Max. Temp., ° F	Removes Particle Size Down To, μm	Removes Oil Content Down To, ppm	Filter Service Indicator Included	Housing Material	Ht.	Wd.	Dp.	Gauge Included		Each		Each
Polycarbonate Bowl—Opaque



		1/2	NPT Female	1/2	NPT Female	30 scfm @ 120 psi	1 1/2	-30	120	120	1	0.002	Yes	Aluminum	24 1/4"	5"	5"	No	8282N111	0000000	3018N123	000000


		Polycarbonate Bowl—Clear



				1/2	NPT Female	1/2	NPT Female	30 scfm @ 120 psi	1	-30	120	120	0.4	0.002	No	Aluminum	16 7/8"	3"	3"	No	3018N11	000000	3018N13	00000


				1/2	NPT Female	1/2	NPT Female	40 scfm @ 120 psi	2	-30	120	120	0.4	0.002	No	Aluminum	21"	4"	4"	No	3018N12	000000	3018N14	000000

Desiccant Compressed Air Dryers


Style D	Style E

Once aftercoolers and separators have removed the bulk of the water, use these dryers to remove any remaining moisture in your air line. To reuse saturated desiccant, heat it in an oven at its reactivation temperature—you'll know it's dry when the color changes. Install these dryers after an oil filter to protect the desiccant.

Style D

The desiccant in Styles D and E comes in a sleeve, so they're easier to maintain than dryers with loose beads. Reheat the entire sleeve to reuse the desiccant. To make sure they drain properly, install these dryers on vertical segments of your air line.

Clear Bowl—Dryers with a clear bowl or a sight glass let you keep an eye on the contents inside.

	Dryers													Replacement Desiccants
	Inlet		Outlet							Overall
	Pipe Size	Thread Type	Pipe Size	Thread Type	Max. Flow Rate @ Pressure	Dew Point, ° F	Max. Temp., ° F	Max. Pressure, psi	Housing Material	Ht.	Dia.		Each		Each
Acrylic Plastic Bowl—Clear



		1/2	NPT Female	1/2	NPT Female	20 scfm @ 100 psi	-40	150	150	Aluminum	11 7/8"	4 3/8"	4437K611	0000000	4437K81	000000


		1	NPT Female	1	NPT Female	60 scfm @ 100 psi	-40	150	150	Aluminum	19 3/4"	6 1/2"	4437K621	00000000	4437K82	00000
		1 1/2	NPT Female	1 1/2	NPT Female	100 scfm @ 100 psi	-40	150	150	Aluminum	21 3/4"	8"	4437K631	00000000	4437K83	000000
		2	NPT Female	2	NPT Female	200 scfm @ 100 psi	-40	150	150	Aluminum	19 1/8"	9 1/2"	4437K641	00000000	4437K84	000000

Style E

Aluminum Bowl— Dryers with a metal bowl are more durable than those with a plastic bowl, and they hold up to vapor better.

Opaque Bowl with Sight Glass—Dryers with a clear bowl or a sight glass let you keep an eye on the contents inside.

	Dryers													Replacement Desiccants
	Inlet		Outlet							Overall
	Pipe Size	Thread Type	Pipe Size	Thread Type	Max. Flow Rate @ Pressure	Dew Point, ° F	Max. Temp., ° F	Max. Pressure, psi	Housing Material	Ht.	Dia.		Each		Each
Aluminum Bowl—Opaque with Sight Glass



		1	NPT Female	1	NPT Female	60 scfm @ 100 psi	-40	150	250	Aluminum	19 3/4"	6 1/2"	4437K6	000000000	4437K82	000000


		1 1/2	NPT Female	1 1/2	NPT Female	100 scfm @ 100 psi	-40	150	250	Aluminum	21 3/4"	8"	4437K7	00000000	4437K83	000000
		2	NPT Female	2	NPT Female	200 scfm @ 100 psi	-40	150	250	Aluminum	19 1/8"	9 1/2"	4437K8	00000000	4437K84	000000

Chemical-Resistant Desiccant Compressed Air Dryers with Filters for Oil and Particle Removal

With a polyurethane bowl and housing, these dryers resist synthetic compressor lubricants, solvents, acids, and other chemicals in your compressed air line. They have a clear bowl so you can monitor contents and the desiccant, which changes color when it needs to be replaced. These dryers use clay desiccant to remove moisture, oil, and particles—no need for a separate filter and dryer. Place them down the line from aftercoolers and separators, which remove most of the water first.

NPT Female × NPT Female

Image of Product. Front orientation. Compressed Air Dryers. Chemical-Resistant Desiccant Compressed Air Dryers with Filters for Oil and Particle Removal, Female Inlet.

NPT female dryers make replacing desiccant easy—simply remove the bowl. When you replace the desiccant, service or replace the filter element to extend its life.

	Dryers													Replacement Desiccants		Replacement Elements		Wall-Mounting Brackets
										Overall
	Inlet Pipe Size	Outlet Pipe Size	Max. Flow Rate @ Pressure	Desiccant Capacity, lb.	Dew Point, ° F	Max. Pressure, psi	Max. Temp., ° F	Removes Particle Size Down To, μm	Housing Material	Dia.	Ht.		Each		Each		Each		Each
Polyurethane Rubber Bowl—Clear



		1/2	1/2	20 scfm @ 100 psi	1/2	-40	250	180	0.3	Polyurethane Rubber	4 5/8"	10 5/8"	4386K6	0000000	4386K41	000000	4386K11	000000	4386K111	000000


		1	1	40 scfm @ 100 psi	1	-40	250	180	0.3	Polyurethane Rubber	6 1/8"	9 1/2"	4386K8	00000000	4437K52	00000	4386K12	00000	4386K112	00000
		1	1	60 scfm @ 100 psi	2	-40	250	180	0.3	Polyurethane Rubber	6 1/8"	14 3/4"	4386K9	00000000	4437K52	00000	4386K13	000000	4386K112	00000

NPT Male × NPT Male

NPT male dryers are installed inline. To replace the desiccant, remove the entire unit from the line.

	Dryers														Replacement Desiccants
										Overall
	Inlet Pipe Size	Outlet Pipe Size	Max. Flow Rate @ Pressure	Desiccant Capacity, lb.	Dew Point, ° F	Max. Pressure, psi	Max. Temp., ° F	Removes Particle Size Down To, μm	Housing Material	Dia.	Ht.	Includes		Each		Each
Polyurethane Rubber Bowl—Clear



		1/2	1/2	15 scfm @ 100 psi	1/2	-40	250	180	0.3	Polyurethane Rubber	3 1/8"	9 1/4"	Mounting Bracket	5164K76	0000000	5164K81	000000