Tube Unions | McMaster-Carr

Clear All

	Type Type	Show

Union

	Type Type	Hide

	Copper Tube Size Copper Tube Size

	Material Material

	Socket Connect Type Socket Connect Type


Cement	Solder

Press

	Pipe Size Pipe Size

	Connection Style Connection Style

Threaded

Socket Connect

Clamp On

	Connection Type Connection Type	Show

	Tube

	Connection Type Connection Type	Hide


Pipe	Tube

	For Use With For Use With

	Shape Shape


Straight	270° Bend

	System of Measurement System of Measurement

Inch

	For Tube OD For Tube OD

	Body Shape Body Shape

	Hex

	Gender Gender

Female

Male

	Thread Type Thread Type

NPT

	For Tube Material For Tube Material

Copper

	Length Length

	For Pipe Material For Pipe Material

Plastic

Steel

Iron

	For Copper Tube Type For Copper Tube Type

	Maximum Temperature Maximum Temperature

100° to 249° F

250° to 499° F

	Maximum Pressure Maximum Pressure

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

Forward

How can we improve?

59 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.

Medium-Pressure Pipe Fittings for Joining Dissimilar Metals

Use these unions to connect different metals in a piping or plumbing system. They have a plastic sleeve that inhibits destructive corrosion. Use them for connections that must be electrically insulated. Unions separate into three pieces for access to your line.

Copper tube size is the accepted designation of the copper tubing industry, not the actual tube OD.

For technical drawings and 3-D models, click on a part number.

Union Straight Socket-Connect Adapters

Exploded View

For Use With: Air, Water, Oil, Natural Gas
Max.Temperature: 180° F

				Iron × Copper
Pipe Size	Copper Tube Size	For Tube OD	Max. Pressure		Each
NPT Female × Socket Connect Female
1/2	1/2	5/8"	250 psi @ 72° F	000000	000000
3/4	1/2	5/8"	250 psi @ 72° F	000000	00000
3/4	3/4	7/8"	250 psi @ 72° F	000000	00000
1	1	1 1/8"	250 psi @ 72° F	000000	00000
1	3/4	7/8"	250 psi @ 72° F	000000	00000
1 1/4	1 1/4	1 3/8"	250 psi @ 72° F	000000	00000
1 1/2	1 1/2	1 5/8"	250 psi @ 72° F	000000	000000
2	2	2 1/8"	250 psi @ 72° F	000000	000000

Drain, Waste, and Vent ABS Pipe Fittings for Chemicals

For Use With: Sodium Hydroxide
Max. Temperature: 180° F
Specifications Met: ASTM D2661, ASTM D3311, ASTM D3965, ASTM F1498
Pipe Nipples and Pipe: Use Schedule 40 ABS Plastic
Flanges: Use Schedule 40 ABS Plastic

These Schedule 40 fittings are an economical option for gravity-flow chemical waste systems. They are ABS plastic, which has excellent strength and impact resistance and good chemical resistance. Fittings meet ASTM D2661, ASTM D3311, ASTM D3965, and ASTM F1498 specifications and testing requirements for material quality and product dimensions.

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

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 VOC (Volatile Organic Compounds) regulations.

For technical drawings and 3-D models, click on a part number.

270° Bend Adapters, Female Socket Connect × Female Compression Tube

Fittings with a compression end are also known as slip-joint fittings. Insert the tube into the compression end and turn the nut until hand tight. Since you don't have to wait for cement to dry, they are quicker to install than socket-connect fittings.

270° bend fittings are also known as P-traps. They separate into three pieces, so you can access your line.

Pipe Size	Socket Dp.	For Tube OD	Material	Color		Each
1 1/2	11/16"	1 1/2"	ABS Plastic	Black	00000000	000000

Pipe Cement (8 fl. oz. Can)

00000000

Each

00000

Aboveground Standard-Wall PVC Pipe Fittings for Drain, Waste, and Vent

For Use With: Water
Max. Temperature: 140° F
Specifications Met: ASTM D1784, ASTM D2665
Pipe Nipples and Pipe: Use Schedule 40 PVC Plastic
Flanges: Use Schedule 40 PVC Plastic

These Schedule 40 fittings are the industry standard for gravity-flow drain, waste, and vent (DWV) applications. Fittings are PVC, which has good corrosion resistance. They meet ASTM D1784 and ASTM D2665 specifications and testing requirements for material quality.

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

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

For technical drawings and 3-D models, click on a part number.

Union 270° Bend Adapters, Female Socket Connect × Female Compression Tube

270° bend fittings are also known as P-traps. They separate into three pieces, so you can access your line.

Pipe Size	Socket Dp.	For Tube OD	Material	Color		Each
1 1/2	13/16"	1 1/2"	PVC Plastic	White	0000000	000000

Pipe Cement (8 fl. oz. Can)

00000000

Each

00000

Solder-Connect Fittings for Copper Tubing

Temperature Range: 32° to 200° F

Solder these fittings to copper tubing or the tube end of another fitting for a permanent, leak-tight connection. They are also known as sweat fittings. Fittings have good corrosion resistance. To adhere to safety standards for drinking water systems, use fittings that meet NSF/ANSI 61 or EN 1057.

Copper tube size is the accepted designation of the copper tubing industry, not the actual tube OD.

For technical drawings and 3-D models, click on a part number.

Union Straight Connectors, Female Socket-Connect Tube

For Use With: Drinking Water
Tubing: Use with K, M, L copper
Specifications Met: See table

Union connectors separate into three pieces for easy access to your line.

Copper Tube Size	For Tube OD	Material	Max. Pressure	Specifications Met		Each
1/4	3/8"	Copper	400 psi @ 72° F	ASME B16.22, MSS-SP104, NSF/ANSI 61	00000000	00000
3/8	1/2"	Copper	400 psi @ 72° F	ASME B16.22, MSS-SP104, NSF/ANSI 61	0000000	0000
1/2	5/8"	Copper	400 psi @ 72° F	ASME B16.22, MSS-SP104, NSF/ANSI 61	0000000	0000
3/4	7/8"	Copper	400 psi @ 72° F	ASME B16.22, MSS-SP104, NSF/ANSI 61	0000000	0000
1	1 1/8"	Copper	400 psi @ 72° F	ASME B16.22, MSS-SP104, NSF/ANSI 61	0000000	00000
1 1/4	1 3/8"	Copper	400 psi @ 72° F	ASME B16.22, MSS-SP104, NSF/ANSI 61	0000000	00000
1 1/2	1 5/8"	Copper	400 psi @ 72° F	ASME B16.22, MSS-SP104, NSF/ANSI 61	0000000	00000
2	2 1/8"	Copper	300 psi @ 72° F	ASME B16.22, MSS-SP104, NSF/ANSI 61	0000000	00000
2 1/2	2 5/8"	Bronze	300 psi @ 72° F	ASME B16.18, NSF/ANSI 61	00000000	000000
3	3 1/8"	Bronze	300 psi @ 72° F	ASME B16.18, NSF/ANSI 61	00000000	000000

Cleaned and Bagged Solder-Connect Fittings for Copper Tubing

For Use With: Drinking Water
Temperature Range: 32° to 200° F
Tubing: Use with K, M, L copper
Specifications Met: ASME B16.22, MSS-SP104, NSF/ANSI 61

When cleanliness is crucial to your application, choose these fittings that are individually cleaned and bagged to prevent contamination. Solder the socket end to copper tubing or the tube end of another fitting for a permanent, leak-tight connection. They are also known as sweat fittings. Fittings have good corrosion resistance. They meet NSF/ANSI 61 safety standards for use with drinking water systems.

Copper tube size is the accepted designation of the copper tubing industry, not the actual tube OD.

For technical drawings and 3-D models, click on a part number.

Union Straight Connectors, Female Socket-Connect Tube

Exploded View

Union connectors separate into three pieces for easy access to your line.

Copper Tube Size	For Tube OD	Material	Max. Pressure		Each
1/4	3/8"	Copper	400 psi @ 72° F	0000000	000000
3/8	1/2"	Copper	400 psi @ 72° F	0000000	00000
1/2	5/8"	Copper	400 psi @ 72° F	0000000	00000
3/4	7/8"	Copper	400 psi @ 72° F	0000000	00000
1	1 1/8"	Copper	400 psi @ 72° F	0000000	00000
1 1/2	1 5/8"	Copper	400 psi @ 72° F	0000000	00000
2	2 1/8"	Copper	400 psi @ 72° F	0000000	00000

Press-Connect Fittings for Copper Tubing

For Use With: Drinking Water
Maximum Pressure: 200psi @ 72° F
Temperature Range: 0° to 250° F
Tubing: Use with K, M, L copper
Specifications Met: See table

Crimp these fittings to copper tubing with a crimping tool (sold separately). An O-ring on the inside of the fitting creates a leak-tight connection that doesn’t require heat or soldering. They are comparable to Viega ProPress fittings. Fittings have good corrosion resistance. They meet NSF/ANSI safety standards for use with drinking water systems.

Unions separate into three pieces for easy access to your line. Union adapters for galvanized steel threaded pipe join copper tubing to galvanized threaded connections on hot water heaters.

Copper tube size is the accepted designation of the copper tubing industry, not the actual tube OD.

For technical drawings and 3-D models, click on a part number.

Union Straight Adapters, Female Press-Connect Tube × Male Threaded Pipe

NPT Threads
Copper Tube Size	For Tube OD	Pipe Size	Lg.	Material	Specifications Met		Each
1/2	5/8"	1/2	2 19/32"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3/4	7/8"	3/4	2 29/32"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1	1 1/8"	1	3 29/64"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1 1/4	1 3/8"	1 1/4	3 33/64"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1 1/2	1 5/8"	1 1/2	4 15/32"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
2	2 1/8"	2	4 9/16"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000

Union Straight Adapters, Female Press-Connect Tube × Female Threaded Pipe

NPT Threads
Copper Tube Size	For Tube OD	Pipe Size	Lg.	Material	Specifications Met		Each
1/2	5/8"	1/2	2 17/64"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3/4	7/8"	3/4	2 27/64"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1	1 1/8"	1	2 7/8"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1 1/4	1 3/8"	1 1/4	2 31/32"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1 1/2	1 5/8"	1 1/2	3 7/8"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
2	2 1/8"	2	3 59/64"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000

Union Straight Adapters for Galvanized Steel Threaded Pipe, Female Press-Connect Tube × Female Pipe

NPT Threads
Copper Tube Size	For Tube OD	Pipe Size	Lg.	Material	Specifications Met		Each
1/2	5/8"	1/2	2 15/64"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3/4	7/8"	3/4	2 9/16"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1	1 1/8"	1	2 9/16"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1 1/4	1 3/8"	1 1/4	2 11/16"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1 1/2	1 5/8"	1 1/2	3 7/64"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
2	2 1/8"	2	3 17/32"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000

Union Straight Connectors, Female Press-Connect Tube

Copper Tube Size	For Tube OD	Lg.	Material	Specifications Met		Each
1/2	5/8"	2 27/32"	Bronze	ASME B16.51, NSF/ANSI 61, UL 213	0000000	000000
3/4	7/8"	3 5/32"	Bronze	ASME B16.51, NSF/ANSI 61, UL 213	0000000	00000
1	1 1/8"	3 41/64"	Bronze	ASME B16.51, NSF/ANSI 61, UL 213	0000000	00000
1 1/4	1 3/8"	3 11/16"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1 1/2	1 5/8"	4 61/64"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
2	2 1/8"	5 7/32"	Bronze	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000

Replacement O-Rings

For Copper Tube Size	For Tube OD	O-Ring Material		Each
1/2	5/8"	EPDM Rubber	0000000	00000
3/4	7/8"	EPDM Rubber	0000000	0000
1	1 1/8"	EPDM Rubber	0000000	0000
1 1/4	1 3/8"	EPDM Rubber	00000000	0000
1 1/2	1 5/8"	EPDM Rubber	00000000	0000
2	2 1/8"	EPDM Rubber	00000000	0000