Valve Caps | McMaster-Carr

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27 Products

Tire Valve Caps


Plastic	Chrome-Plated Brass

Keep dust and debris out of your tire valve.

Material	Pkg. Qty.		Pkg.
Plastic	5	4991T956	00000
Chrome-Plated Brass	4	4991T94	0000

Air Conditioner Service Valve Caps

Seal service valve ports on air conditioning systems, preventing refrigerant loss and keeping out moisture and debris between service intervals.

Brass—Resists corrosion in outdoor and high-humidity HVAC environments.

	Cap
For Valve Port Thread Dia.	Thread Type	Material	Pkg. Qty.		Pkg.
1/4"	UN/UNF (SAE 45°)	Brass	10	1883K12	00000
3/8"	UN/UNF (SAE 45°)	Brass	3	1883K14	0000

Solder-Mount Air Conditioner Service Valves

Tap into refrigerant lines to drain and fill your system. These valves are self-piercing and can be installed without drilling a hole into the line. A valve cap is included.

		Valve Port Thread			Core
For Tube OD	Lg.	Dia.	Type	Gender	Dia.	Material	Body Material		Each
1/4"	1 1/2"	1/4"	UN/UNF (SAE 45°)	Male	1/4"	Nickel-Plated Brass	Copper	1804K31	000000
5/16"	1 1/2"	1/4"	UN/UNF (SAE 45°)	Male	1/4"	Nickel-Plated Brass	Copper	1804K32	00000
3/8"	1 1/2"	1/4"	UN/UNF (SAE 45°)	Male	1/4"	Nickel-Plated Brass	Copper	1804K33	00000
1/2"	1 1/2"	1/4"	UN/UNF (SAE 45°)	Male	1/4"	Nickel-Plated Brass	Copper	1804K34	00000
5/8"	1 1/2"	1/4"	UN/UNF (SAE 45°)	Male	1/4"	Nickel-Plated Brass	Copper	1804K35	00000
3/4"	1 1/2"	1/4"	UN/UNF (SAE 45°)	Male	1/4"	Nickel-Plated Brass	Copper	1804K36	00000

Air Conditioner Service Valve Caps

	Pkg. Qty.		Pkg.
1/4" SAE Brass Caps	10	1883K12	00000

Long-Reach Air Conditioner Service Valves

For hard-to-reach spaces, these valves are longer than standard air conditioner service valves. They tap into refrigerant lines to drain and fill your system. All have a removable core to provide unobstructed flow for your refrigerant once the core is removed. A valve cap is included.

Replacement Cores—Replacement cores and core kits are sold separately. The kits include a core remover with four valve cores.

Valves											Replacement Cores			Core Kits
		Valve Port Thread			Core
For Tube OD	Lg.	Dia.	Type	Gender	Dia.	Material	Body Material	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.		Each
1/8"	3"	1/4"	UN/UNF (SAE 45°)	Male	1/4"	Nickel-Plated Brass	Brass	5	1885K12	000000	6	1756K33	00000	1756K31	000000
1/4"	2 15/16"	1/4"	UN/UNF (SAE 45°)	Male	1/4"	Nickel-Plated Brass	Brass	5	1885K14	00000	6	1756K33	0000	1756K31	00000
5/16"	2 13/16"	1/4"	UN/UNF (SAE 45°)	Male	1/4"	Nickel-Plated Brass	Brass	5	1885K15	00000	6	1756K33	0000	1756K31	00000
3/8"	2 13/16"	1/4"	UN/UNF (SAE 45°)	Male	1/4"	Nickel-Plated Brass	Brass	5	1885K16	00000	6	1756K33	0000	1756K31	00000
1/2"	2 1/8"	1/4"	UN/UNF (SAE 45°)	Male	1/4"	Nickel-Plated Brass	Brass	3	1885K17	00000	6	1756K33	0000	1756K31	00000

Air Conditioner Service Valve Caps

	Pkg. Qty.		Pkg.
1/4" SAE Brass Caps	10	1883K12	00000

Clamp-On Air Conditioner Service Valves


Style 1	Style 2

Tap into refrigerant lines to drain and fill your system. These valves are self-piercing and can be installed without drilling a hole into the line. A valve cap is included.

Style 2—Style 2 has a removable core to provide unobstructed flow for your refrigerant once the core is removed.

Replacement Cores—Replacement cores and core kits are sold separately. The kits include a core remover with four valve cores.

Valves											Replacement Cores			Core Kits
			Valve Port Thread			Core
Style	For Tube OD	Lg.	Dia.	Type	Gender	Dia.	Material	Body Material		Each	Pkg. Qty.		Pkg.		Each
1	1/4", 5/16", 3/8"	1 3/4"	1/4"	UN/UNF (SAE 45°)	Male	—	—	Zinc Alloy	9778K12	000000	—	———	0	———	0
1	1/2", 5/8"	2 1/8"	1/4"	UN/UNF (SAE 45°)	Male	—	—	Zinc Alloy	9778K14	00000	—	———	0	———	0
2	1/4", 5/16", 3/8"	1 1/2"	1/4"	UN/UNF (SAE 45°)	Male	1/4"	Stainless Steel	Zinc Alloy	1809K28	00000	6	1756K33	00000	1756K31	000000
2	1/2", 5/8"	1 13/16"	1/4"	UN/UNF (SAE 45°)	Male	1/4"	Stainless Steel	Zinc Alloy	1809K29	00000	6	1756K33	0000	1756K31	00000

Air Conditioner Service Valve Caps

	Pkg. Qty.		Pkg.
1/4" SAE Brass Caps	10	1883K12	00000

Quick-Locking Expansion Plugs

Save time sealing off pipe or valve box openings. These plugs install with one quarter turn of the handle, unlike wing-nut expansion plugs that require multiple turns. They temporarily close off your line with plastic feet that expand mechanically. The feet create a longer-lasting seal than plugs that expand with internal pressure, which can loosen over time. Since these plugs have no pressure ratings, they’re best for low-pressure applications. They’re often used in valve boxes to keep out dirt and debris.

Black Handle—Plugs with a black handle often signify a closed-off wastewater line.

Blue Handle—Plugs with a blue handle often signify a closed-off water line.

Maximum Air Back Pressure—Maximum air back pressure is the amount of pressure a plug can withstand without moving.

Maximum Water Back Pressure—Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.

For Pipe		Max. Back Pressure					Blue Plastic Handle		Black Plastic Handle
Size	ID	Air	Water	Overall Ht.	Temp. Range, ° F	Seal Material		Each		Each







			Plastic Plate

			4	4.00" to 4.50"	Not Rated	Not Rated	4"	-40 to 220	TPE	6594N11	000000	6594N12	000000


			6	6.00" to 6.75"	Not Rated	Not Rated	3 3/4"	-40 to 220	TPE	6594N21	00000	6594N22	00000
			8	8.00" to 8.50"	Not Rated	Not Rated	4"	-40 to 220	TPE	6594N31	00000	6594N32	00000