Socket Connect Bungs | McMaster-Carr

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For Use With

Acetic Acid (White Vinegar) (10% Concentration)

Hydrochloric Acid (25% Concentration)

Natural Gas

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Phosphoric Acid

Phosphoric Acid (85% Concentration)

Salt Water

Sodium Hydroxide (Caustic Soda) (50% Concentration)

Steam

Sulfuric Acid (75% Concentration)

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105 Products

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

High-Pressure Socket-Connect Stainless Steel Unthreaded Pipe Fittings

Forged for excellent strength, these heavy duty socket-connect fittings stand up to high-pressure applications. They are easier to weld than butt-weld fittings because the fitting doesn’t need to align perfectly to the pipe. Slide pipe into the socket and weld for a strong, permanent connection.

304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.

Socket connect x butt weld straight adapters are also known as half couplings.

Straight Adapters

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: 3000
Specifications Met: ASME B16.11, ASTM A182
Pipe Nipples and Pipe: Use Schedule 80 stainless steel

304/304L Stainless Steel
Pipe Size	Dash Size	Max. Steam Pressure	Max. Pressure		Each
Socket Connect × Butt Weld
1/8	02	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	000000
1/4	04	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	00000
3/8	06	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	00000
1/2	08	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	00000
3/4	12	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	00000
1	16	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	00000
1 1/2	24	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	00000
2	32	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	000000
316/316L Stainless Steel
Socket Connect × Butt Weld
1/8	02	1,900 psi @ 350° F	3,000 psi @ 72° F	000000000	00000
1/4	04	1,900 psi @ 350° F	3,000 psi @ 72° F	000000000	00000
3/8	06	1,900 psi @ 350° F	3,000 psi @ 72° F	000000000	00000
1/2	08	1,900 psi @ 350° F	3,000 psi @ 72° F	000000000	00000
3/4	12	1,900 psi @ 350° F	3,000 psi @ 72° F	000000000	00000
1	16	1,900 psi @ 350° F	3,000 psi @ 72° F	000000000	00000
2	32	1,900 psi @ 350° F	3,000 psi @ 72° F	000000000	000000

High-Pressure Socket-Connect Steel Unthreaded Pipe Fittings

Socket-connect fittings are easier to weld than butt-weld fittings because the fitting doesn’t need to align perfectly to the pipe. Slide pipe into the socket and weld for a strong, permanent connection. Fittings have heavy duty construction that stands up to high-pressure applications. They are for use in noncorrosive environments.

Socket connect x butt weld straight adapters are also known as half couplings.

Straight Adapters

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class : 3000
Specifications Met: ASTM A105, ASME B16.11
Pipe Nipples and Pipe: Use Schedule 80 steel
Flanges: Use Class 300 and 600 steel

Socket Connect Female × Butt Weld
Pipe Size	Wall Thick.	Construction	Max. Pressure	Max. Steam Pressure	Material		Each
1/8	0.255"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	00000
1/4	0.335"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	0000
3/8	0.301"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	0000
1/2	0.33"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	0000
3/4	0.355"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	0000
1	0.396"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	0000
1 1/4	0.45"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	00000
1 1/2	0.46"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	00000
2	0.48"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	00000
2 1/2	0.608"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	000000
3	0.651"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	000000
4	0.765"	Seamless	3,000 psi @ 72° F	Not Rated	Steel	000000000	000000

Thick-Wall Plastic Pipe Fittings for Water

Connect these fittings to Schedule 80 pipe. With thicker, stronger walls than standard-wall fittings, they can handle heavy duty supply applications, such as water processing, wastewater treatment, and irrigation. Fittings are plastic for good corrosion resistance. They meet ASTM specifications and testing requirements for material quality.

Fittings for drinking water meet NSF/ANSI Standard 61.

Attach socket-connect ends to unthreaded pipe or another socket-connect fitting with a PVC primer and cement (also known as solvent weld).

To prevent leaks in threaded connections, apply a sealant to the male threads. For plastic threads, apply a non-hardening, plastic-compatible sealant sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic connections. Note: For fittings that are not rated for pressure, you can use the pressure rating of the plastic pipe as a reference. Threaded fittings are limited to 50% of the rated pressure of the pipe.

Warning: Never use plastic pipe fittings and pipe with compressed air or gas.

Through‐Wall Straight Connectors, Female Socket Connect

For Use With: Drinking Water, Water
Maximum Temperature: 140° F
Specifications Met: ASTM D1784, NSF/ANSI 61
Pipe Nipples and Pipe: Use Schedule 80 PVC Plastic
Flanges: Use Class 150 PVC Plastic

Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through a wall, tank, or panel to create an inlet or outlet for faucets, pipes, and spigots.

Pipe Size	Socket Depth	For Hole Dia.	For Max. Wall Thick.	Material	Gasket Material	Color	Max. Pressure		Each
1/2	29/32"	1 3/8"	2 5/64"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	000000
3/4	1 1/64"	1 5/8"	2 5/64"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	00000
1	1 9/64"	1 7/8"	2 5/64"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	00000
1 1/4	1 17/64"	2 21/32"	2"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	00000
1 1/2	1 25/64"	2 21/32"	2"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	00000
2	1 33/64"	3 1/4"	2"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	00000
3	1 57/64"	4 1/2"	2 1/8"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	00000
4	2 17/64"	5 3/4"	2 29/64"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	000000
6	3 1/32"	8 1/16"	3 1/4"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	000000

Through‐Wall Straight Adapters, Female Socket Connect × Female Threaded Pipe

For Use With: Drinking Water, Water
Maximum Temperature: 140° F
Specifications Met: ASTM D1784, NSF/ANSI 61
Pipe Nipples and Pipe: Use Schedule 80 PVC Plastic
Flanges: Use Class 150 PVC Plastic

Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through a wall, tank, or panel to create an inlet or outlet for faucets, pipes, and spigots.

NPT Threads
Pipe Size	Socket Depth	For Hole Dia.	For Max. Wall Thick.	Material	Gasket Material	Color	Max. Pressure		Each
1/4	5/8"	1 1/16"	1/2"	PVC Plastic	Neoprene Rubber	Dark Gray	150 psi @ 72° F	00000000	000000
3/8	3/4"	1 3/16"	1/2"	PVC Plastic	Neoprene Rubber	Dark Gray	150 psi @ 72° F	00000000	00000
1/2	29/32"	1 3/8"	2 5/64"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	00000
1/2	1 7/8"	1 1/2"	3/4"	PVC Plastic	Neoprene Rubber	Dark Gray	150 psi @ 72° F	0000000	00000
3/4	1"	1 3/4"	3/4"	PVC Plastic	Neoprene Rubber	Dark Gray	150 psi @ 72° F	0000000	00000
3/4	1 1/64"	1 5/8"	2 5/64"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	00000
1	1 1/8"	2"	13/16"	PVC Plastic	Neoprene Rubber	Dark Gray	150 psi @ 72° F	0000000	00000
1	1 9/64"	1 7/8"	2 5/64"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	00000
1 1/4	1 1/4"	2 3/8"	13/16"	PVC Plastic	Neoprene Rubber	Dark Gray	150 psi @ 72° F	0000000	00000
1 1/4	1 17/64"	2 21/32"	2"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	00000
1 1/2	1 3/8"	2 3/4"	13/16"	PVC Plastic	Neoprene Rubber	Dark Gray	150 psi @ 72° F	0000000	00000
1 1/2	1 25/64"	2 21/32"	2"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	00000
2	1 1/2"	3 3/8"	1 3/16"	PVC Plastic	Neoprene Rubber	Dark Gray	150 psi @ 72° F	0000000	00000
2	1 33/64"	3 1/4"	2"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	00000
3	1 7/8"	4 5/8"	2"	PVC Plastic	Neoprene Rubber	Dark Gray	150 psi @ 72° F	0000000	000000
3	1 57/64"	4 1/2"	2 1/8"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	00000
4	2 1/4"	5 1/2"	1 1/4"	PVC Plastic	Neoprene Rubber	Dark Gray	150 psi @ 72° F	0000000	000000
4	2 17/64"	5 3/4"	2 29/64"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	000000
6	3"	8"	2 1/16"	PVC Plastic	Neoprene Rubber	Dark Gray	150 psi @ 72° F	0000000	000000
6	3 1/32"	8 1/16"	3 1/4"	PVC Plastic	EPDM Rubber	Dark Gray	150 psi @ 72° F	000000000	000000

CPVC Pipe Fittings for Hot Water

Made of CPVC, these fittings can handle high temperatures. They have thick, strong walls to handle heavy duty industrial plumbing and water supply applications, such as water processing and waste water treatment. They also have good corrosion resistance. These fittings are comparable to Corzan. Some meet ASTM D1784 specifications and testing requirements for material quality.

Fittings for drinking water meet NSF/ANSI Standard 61.

Schedule 80 fittings have thick, strong walls for heavy duty, industrial applications.

Warning: Never use plastic pipe fittings and pipe with compressed air or gas.

Sealants cannot be sold to Colorado, Connecticut, District of Columbia, Delaware, Illinois, Indiana, Massachusetts, Maryland, Maine, Michigan, New Hampshire, New Jersey, Northern Virginia, New York, Ohio, Pennsylvania, Rhode Island, or Utah due to local regulatory limits on VOCs (Volatile Organic Compounds).

Through-Wall Straight Connectors, Female Socket Connect

For Use With: Calcium Chloride, Deionized Water, Drinking Water, Hydrochloric Acid (25%), Phosphoric Acid (85%), Salt Water, Sodium Hydroxide (50%), Sulfuric Acid (75%), Water
Maximum Temperature: 180° F
Specifications Met: ASTM D1784, NSF/ANSI 61
Pipe Nipples and Pipe: Use Schedule 80 CPVC Plastic
Flanges: Use Class 150 CPVC Plastic

Attach socket-connect ends to unthreaded pipe or another socket-connect fitting with a CPVC primer and cement (also known as solvent weld).

Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through a wall, tank, or panel to create an inlet or outlet for faucets, pipes, and spigots.

Pipe Size	Socket Depth	For Hole Dia.	For Max. Wall Thick.	Material	Gasket Material	Schedule	Color	Max. Pressure		Each
1/2	29/32"	1 3/8"	1 5/64"	CPVC Plastic	EPDM Rubber	80	Light Gray	150 psi @ 72° F	00000000	000000
3/4	1 1/64"	1 5/8"	1 5/64"	CPVC Plastic	EPDM Rubber	80	Light Gray	150 psi @ 72° F	00000000	00000
1	1 9/64"	1 7/8"	1 5/64"	CPVC Plastic	EPDM Rubber	80	Light Gray	150 psi @ 72° F	00000000	00000
1 1/4	1 17/64"	2 5/8"	1"	CPVC Plastic	EPDM Rubber	80	Light Gray	150 psi @ 72° F	00000000	00000
1 1/2	1 25/64"	2 5/8"	1"	CPVC Plastic	EPDM Rubber	80	Light Gray	150 psi @ 72° F	00000000	00000
2	1 33/64"	3 1/4"	1"	CPVC Plastic	EPDM Rubber	80	Light Gray	150 psi @ 72° F	00000000	00000
3	1 57/64"	4 1/2"	1 1/64"	CPVC Plastic	EPDM Rubber	80	Light Gray	150 psi @ 72° F	00000000	000000
4	2 17/64"	5 3/4"	1 29/64"	CPVC Plastic	EPDM Rubber	80	Light Gray	150 psi @ 72° F	00000000	000000

Pipe Cement for Max. Pipe Size 6

00000000

Each

000000

Through‐Wall Straight Adapters, Female Socket Connect × Female Threaded Pipe

For Use With:
Fittings with Neoprene Rubber Gaskets: Drinking Water, Water
All other fittings: Acetic Acid (10%), Calcium Chloride, Deionized Water, Hydrochloric Acid (25%), Phosphoric Acid, Salt Water, Sodium Hydroxide (50%), Sulfuric Acid (75%), Water
Maximum Temperature:
Fittings with Neoprene Rubber Gasket: 200° F
All other fittings: 180° F
Specifications Met:
Fittings with Neoprene Rubber Gaskets: ASTM D1784, NSF/ANSI 61
All other fittings: ASTM D1784
Pipe Nipples and Pipe: Use Schedule 80 CPVC Plastic
Flanges: Use Class 150 CPVC Plastic

Attach socket-connect ends to unthreaded pipe or another socket-connect fitting with a CPVC primer and cement (also known as solvent weld).

To prevent leaks in threaded connections, apply a non-hardening, plastic-compatible sealant to the male threads. Tape or sealants with PTFE are not recommended for plastic-to-plastic threaded connections. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.

Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through a wall, tank, or panel to create an inlet or outlet for faucets, pipes, and spigots.

NPT Threads
Pipe Size	Socket Depth	For Hole Dia.	For Max. Wall Thick.	Material	Gasket Material	Color	Max. Pressure		Each
1/4	5/8"	1 1/16"	1/2"	CPVC Plastic	Neoprene Rubber	Light Gray	150 psi @ 72° F	00000000	000000
3/8	3/4"	1 3/16"	1/2"	CPVC Plastic	Neoprene Rubber	Light Gray	150 psi @ 72° F	00000000	00000
1/2	7/8"	1 1/2"	3/4"	CPVC Plastic	Neoprene Rubber	Light Gray	150 psi @ 72° F	0000000	00000
1/2	29/32"	1 3/8"	2 1/16"	CPVC Plastic	EPDM Rubber	Light Gray	150 psi @ 72° F	000000000	00000
3/4	1"	1 3/4"	3/4"	CPVC Plastic	Neoprene Rubber	Light Gray	150 psi @ 72° F	0000000	00000
3/4	1 1/64"	1 5/8"	2 1/16"	CPVC Plastic	EPDM Rubber	Light Gray	150 psi @ 72° F	000000000	00000
1	1 1/8"	2"	13/16"	CPVC Plastic	Neoprene Rubber	Light Gray	150 psi @ 72° F	0000000	00000
1	1 9/64"	1 7/8"	2 1/16"	CPVC Plastic	EPDM Rubber	Light Gray	150 psi @ 72° F	000000000	00000
1 1/4	1 17/64"	2 5/8"	2"	CPVC Plastic	EPDM Rubber	Light Gray	150 psi @ 72° F	000000000	00000
1 1/2	1 17/64"	2 5/8"	2"	CPVC Plastic	EPDM Rubber	Light Gray	150 psi @ 72° F	000000000	00000
1 1/2	1 3/8"	2 3/4"	13/16"	CPVC Plastic	Neoprene Rubber	Light Gray	150 psi @ 72° F	0000000	00000
2	1 25/64"	3 1/4"	2"	CPVC Plastic	EPDM Rubber	Light Gray	150 psi @ 72° F	000000000	00000
2	1 1/2"	3 3/8"	1 3/16"	CPVC Plastic	Neoprene Rubber	Light Gray	150 psi @ 72° F	0000000	000000
3	1 57/64"	4 1/2"	2 1/8"	CPVC Plastic	EPDM Rubber	Light Gray	150 psi @ 72° F	000000000	000000
4	2 17/64"	5 3/4"	2 7/16"	CPVC Plastic	EPDM Rubber	Light Gray	150 psi @ 72° F	000000000	000000
6	3 1/32"	8 1/16"	3 1/4"	CPVC Plastic	EPDM Rubber	Light Gray	150 psi @ 72° F	000000000	000000

High-Purity Polypropylene Pipe Fittings for Corrosive Chemicals

The inside of these fittings won’t leach contaminants into your line or accumulate particles—they’re polished to an ultra-smooth 12 Ra finish, which also makes them easy to clean. Made of polypropylene, they resist organic solvents, acids, and alkalis better than CPVC fittings. These fittings meet NSF/ANSI 61 for use with drinking water, and they’re FDA compliant for direct contact with food. They also meet ASTM requirements for material and performance, and ISO requirements for dimensions.

Connect them to pipe with socket fusion welding for a strong, permanent bond. Use a socket fusion tool with a heater bushing (sold separately) that matches your pipe size.

Warning: Never use plastic pipe fittings and pipe with compressed air or gas.

Union Straight Connectors, Female Socket Fusion Connect

For Use With: Deionized Water, Drinking Water, Hydrochloric Acid, Phosphoric Acid, Salt Water, Solvents
Temperature Range: 32° to 200° F
Specifications Met: ASTM D2837, ASTM D4101, FDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.3297, ISO 7279, NSF/ANSI 61
Pipe Nipples and Pipe: Use SDR 11 Polypropylene Plastic
Flanges: Use Polypropylene Plastic

Union connectors separate into three pieces, so you can access your line without unthreading pipe connections.

EPDM Rubber O-Ring
Pipe Size	Socket Dp.	Material	Color	Max. Pressure		Each
1/2	19/32"	Polypropylene Plastic	Light Gray	150 psi @ 72° F	00000000	0000000
3/4	5/8"	Polypropylene Plastic	Light Gray	150 psi @ 72° F	00000000	000000
1	45/64"	Polypropylene Plastic	Light Gray	150 psi @ 72° F	00000000	000000
1 1/2	15/16"	Polypropylene Plastic	Light Gray	150 psi @ 72° F	00000000	000000
2	1 1/16"	Polypropylene Plastic	Light Gray	150 psi @ 72° F	00000000	000000
Viton® Fluoroelastomer Rubber O-Ring
1/2	19/32"	Polypropylene Plastic	Light Gray	150 psi @ 72° F	00000000	000000
3/4	5/8"	Polypropylene Plastic	Light Gray	150 psi @ 72° F	00000000	000000
1	45/64"	Polypropylene Plastic	Light Gray	150 psi @ 72° F	00000000	000000
1 1/2	15/16"	Polypropylene Plastic	Light Gray	150 psi @ 72° F	00000000	000000
2	1 1/16"	Polypropylene Plastic	Light Gray	150 psi @ 72° F	00000000	000000

Straight Ball Valves with Lockable Lever Handle, Female Socket Fusion Connect

For Use With: Deionized Water, Drinking Water, Hydrochloric Acid, Phosphoric Acid, Salt Water, Solvents
Temperature Range: 32° to 200° F
Specifications Met: ASTM D2837, ASTM D4101, FDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.3297, ISO 7279, NSF/ANSI 61
Seal Material: See table
Seat Material: PTFE Plastic

Add a ball valve to control the flow in your line.

EPDM Rubber Seal
Pipe Size	Flow Coefficient (Cv)	Vacuum Rating, in. of Hg	Port Type	End-to-End Lg.	Color	Max. Pressure		Each
Polypropylene Plastic
1/2	12.5	29.92	Full	3 13/16"	Light Gray	150 psi @ 0° F	00000000	0000000
3/4	28	29.92	Full	4 9/32"	Light Gray	150 psi @ 0° F	00000000	000000
1	50.9	29.92	Full	4 23/32"	Light Gray	150 psi @ 0° F	00000000	000000
1 1/2	150	29.92	Full	6 1/16"	Light Gray	150 psi @ 0° F	00000000	000000
2	230	29.92	Full	6 13/16"	Light Gray	150 psi @ 0° F	00000000	000000
Viton® Fluoroelastomer Rubber Seal
Polypropylene Plastic
1/2	12.5	29.92	Full	3 13/16"	Light Gray	150 psi @ 0° F	00000000	000000
3/4	28	29.92	Full	4 9/32"	Light Gray	150 psi @ 0° F	00000000	000000
1	50.9	29.92	Full	4 23/32"	Light Gray	150 psi @ 0° F	00000000	000000
1 1/2	150	29.92	Full	6 1/16"	Light Gray	150 psi @ 0° F	00000000	000000
2	230	29.92	Full	6 13/16"	Light Gray	150 psi @ 0° F	00000000	000000

Socket Fusion Weld Tools

		Each
	00000000	0000000

Heater Bushings

For Pipe Size		Each
1	00000000	0000000
1 1/2	00000000	000000
2	00000000	000000