3 1/8" Tube Adapters | McMaster-Carr

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63 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.

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.

Straight Adapters, Male Socket-Connect Tube × Female Socket-Connect Tube

For Use With: Drinking Water
Tubing: Use with K, M, L copper
Specifications Met: ASME B16.22, MSS-SP104, NSF/ANSI 61

Tube Connection (A)		Tube Connection (B)
Copper Tube Size	Tube OD	Socket Depth	Copper Tube Size	For Tube OD	Material	Max. Pressure	Lg.		Each
3	3 1/8"	1 11/32"	2	2 1/8"	Copper	300 psi @ 72° F	3 55/64"	00000000	000000

Straight Adapters, Female Socket-Connect Tube × Male Threaded Pipe

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

NPT Threads
Copper Tube Size	For Tube OD	Pipe Size	Material	Max. Pressure	Specifications Met		Each
3	3 1/8"	3	Copper	300 psi @ 72° F	ASME B16.22, MSS-SP104, NSF/ANSI 61	00000000	000000

Flanges, Female Socket-Connect Tube

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

Fittings with flange end bolt to equipment or another same-size flange to create an access point within a line.

Copper Tube Size	For Tube OD	Flange OD	Bolt Circle Dia.	Number of Bolt Holes	Bolt Hole Diameter	For Bolt Diameter	Bolts Included	Material	Max. Pressure	Specifications Met		Each
3	3 1/8"	7 1/2"	6"	4	3/4"	5/8"	No	Brass	300 psi @ 72° F	ASME B16.22, MSS-SP104, NSF/ANSI 61	00000000	0000000

Straight Connectors, Female Socket-Connect Tube

For Use With: Drinking Water
Tubing: Use with K, M, L copper
Specifications Met: ASME B16.22, MSS-SP104, NSF/ANSI 61

Copper Tube Size	For Tube OD	Material	Max. Pressure		Each
3	3 1/8"	Copper	300 psi @ 72° F	00000000	000000

Straight Connectors with Center Stop, Female Socket-Connect Tube

For Use With: Drinking Water
Tubing: See table
Specifications Met: See table

Fittings with center stop have a small internal ridge that prevents the tubing from sliding all the way through the fitting.

Copper Tube Size	For Tube OD	Material	Max. Pressure	For Copper Tube Type	Specifications Met		Each
3	3 1/8"	Copper	300 psi @ 72° F	K, M, L	ASME B16.22, MSS-SP104, NSF/ANSI 61	00000000	000000

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
3	3 1/8"	Bronze	300 psi @ 72° F	ASME B16.18, NSF/ANSI 61	00000000	0000000

Straight Reducers with Center Stop, Female Socket-Connect Tube

For Use With: Drinking Water
Tubing: See table
Specifications Met: See table

Fittings with center stop have a small internal ridge that prevents the tubing from sliding all the way through the fitting.

Tube Connection (A)		Tube Connection (B)
Copper Tube Size	For Tube OD	Copper Tube Size	For Tube OD	Material	Max. Pressure	For Copper Tube Type	Specifications Met		Each
3	3 1/8"	1 1/2	1 5/8"	Copper	300 psi @ 72° F	K, M, L	ASME B16.22, MSS-SP104, NSF/ANSI 61	00000000	000000
3	3 1/8"	2	2 1/8"	Copper	300 psi @ 72° F	K, M, L	ASME B16.22, MSS-SP104, NSF/ANSI 61	00000000	00000
3	3 1/8"	2 1/2	2 5/8"	Copper	300 psi @ 72° F	K, M, L	ASME B16.22, MSS-SP104, NSF/ANSI 61	00000000	00000
4	4 1/8"	3	3 1/8"	Copper	200 psi @ 72° F	K, M, L	ASME B16.22, MSS-SP104, NSF/ANSI 61	00000000	00000

Short 90° Elbow Adapters, Male Socket-Connect Tube × Female Socket-Connect Tube

For Use With: Drinking Water
Tubing: See table
Specifications Met: See table

Tube Connection (Male)		Tube Connection (Female)
Copper Tube Size	Tube OD	Copper Tube Size	For Tube OD	Material	Max. Pressure	For Copper Tube Type	Specifications Met		Each
3	3 1/8"	3	3 1/8"	Copper	300 psi @ 72° F	K, M, L	ASME B16.22, MSS-SP104, NSF/ANSI 61	00000000	000000

Long 90° Elbow Adapters, Male Socket-Connect Tube × Female Socket-Connect Tube

For Use With: Drinking Water
Tubing: Use with K, M, L copper
Specifications Met: ASME B16.22, MSS-SP104, NSF/ANSI 61

Tube Connection (Male)		Tube Connection (Female)
Copper Tube Size	Tube OD	Copper Tube Size	For Tube OD	Material	Max. Pressure		Each
3	3 1/8"	3	3 1/8"	Copper	300 psi @ 72° F	00000000	000000

Short 90° Elbow Connectors, Female Socket-Connect Tube

For Use With: Drinking Water
Tubing: See table
Specifications Met: See table

Copper Tube Size	For Tube OD	Material	Max. Pressure	For Copper Tube Type	Specifications Met		Each
3	3 1/8"	Copper	300 psi @ 72° F	K, M, L	ASME B16.22, MSS-SP104, NSF/ANSI 61	00000000	000000

Long 90° Elbow Connectors, Female Socket-Connect Tube

For Use With: Drinking Water
Tubing: See table
Specifications Met: See table

Copper Tube Size	For Tube OD	Material	Max. Pressure	For Copper Tube Type	Specifications Met		Each
3	3 1/8"	Copper	300 psi @ 72° F	K, M, L	ASME B16.22, MSS-SP104, NSF/ANSI 61	00000000	000000

90° Elbow Reducers, Female Socket-Connect Tube

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

Tube Connection (A)		Tube Connection (B)
Copper Tube Size	For Tube OD	Copper Tube Size	For Tube OD	Material	Max. Pressure	Specifications Met		Each
For Use With Drinking Water
3	3 1/8"	2 1/2	2 5/8"	Copper	300 psi @ 72° F	ASME B16.22, MSS-SP104, NSF/ANSI 61	00000000	0000000

45° Elbow Adapters, Male Socket-Connect Tube × Female Socket-Connect Tube

For Use With: Drinking Water
Tubing: See table
Specifications Met: See table

Tube Connection (Male)		Tube Connection (Female)
Copper Tube Size	For Tube OD	Copper Tube Size	For Tube OD	Material	Max. Pressure	For Copper Tube Type	Specifications Met		Each
3	3 1/8"	3	3 1/8"	Copper	300 psi @ 72° F	K, M, L	ASME B16.22, MSS-SP104, NSF/ANSI 61	00000000	000000

45° Elbow Connectors, Female Socket-Connect Tube

For Use With: Drinking Water
Tubing: See table
Specifications Met: See table

Copper Tube Size	For Tube OD	Material	Max. Pressure	For Tube Material	For Copper Tube Type	Specifications Met		Each
3	3 1/8"	Copper	300 psi @ 72° F	Copper	K, M, L	ASME B16.22, MSS-SP104, NSF/ANSI 61	00000000	000000

Tee Connectors, Female Socket-Connect Tube

For Use With: Drinking Water
Tubing: See table
Specifications Met: See table

Copper Tube Size	For Tube OD	Material	Max. Pressure	For Copper Tube Type	Specifications Met		Each
3	3 1/8"	Copper	300 psi @ 72° F	K, M, L	ASME B16.22, MSS-SP104, NSF/ANSI 61	00000000	000000

Inline Tee Reducers, Female Socket-Connect Tube

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

Inline tees are also known as branch tees.

Tube Connection (A)		Tube Connection (B)
Copper Tube Size	For Tube OD	Copper Tube Size	For Tube OD	Material	Max. Pressure	Specifications Met		Each
For Use With Drinking Water
3	3 1/8"	1 1/2	1 5/8"	Copper	300 psi @ 72° F	ASME B16.22, MSS-SP104, 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.

Straight Reducers with Center Stop, Female Socket-Connect Tube

Fittings with center stop have a small bump that prevents the tubing from sliding all the way through the fitting.

Tube Connection (A)		Tube Connection (B)
Copper Tube Size	For Tube OD	Copper Tube Size	For Tube OD	Material	Max. Pressure		Each
3	3 1/8"	2	2 1/8"	Copper	300 psi @ 72° F	0000000	000000

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.

Straight adapters with flanged end bolt to equipment or other flanged connections found on pumps and valves to create a convenient access point.

Straight connectors with smooth interior are for use in tight spots when your line can’t be moved. Unlike straight connectors with a stop, these slide onto tubing and can be moved up and down for easy positioning. They are also known as repair couplings.

Inline tees are also known as branch tees. Right-angle tees are also known as run tees. Use inline and right-angle tee adapters to add lines or components, such as gauges, without additional fittings.

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.

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

NPT Threads
Copper Tube Size	For Tube OD	Pipe Size	Lg.	Material	Specifications Met		Each
3	3 1/8"	3	4 51/64"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000

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

NPT Threads
Copper Tube Size	For Tube OD	Pipe Size	Lg.	Material	Specifications Met		Each
3	3 1/8"	3	4 13/16"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000

Straight Adapters, Female Press-Connect Tube × Flanged Pipe

					Bolt Hole
Copper Tube Size	For Tube OD	Pipe Size	Flange OD	Bolt Circle Dia.	Dia.	No. of	For Bolt Dia.	Bolts Included	Lg.	Material	Flange Material	Specifications Met		Each
3	3 1/8"	3	7 31/64"	5 63/64"	3/4"	4	5/8"	No	3 11/64"	Copper	Powder-Coated Steel	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000

Straight Connectors with Center Stop, Female Press-Connect Tube

Copper Tube Size	For Tube OD	Lg.	Material	Specifications Met		Each
3	3 1/8"	4 59/64"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000

Straight Connectors with Smooth Interior, Female Press-Connect Tube

Copper Tube Size	For Tube OD	Lg.	Material	Specifications Met		Each
3	3 1/8"	4 59/64"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000

Straight Reducers with Center Stop, Female Press-Connect Tube

Tube Connection (A)		Tube Connection (B)
Copper Tube Size	For Tube OD	Copper Tube Size	For Tube OD	Lg.	Material	Specifications Met		Each
3	3 1/8"	1 1/2	1 5/8"	5 11/64"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000
3	3 1/8"	2	2 1/8"	5 5/64"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3	3 1/8"	2 1/2	2 5/8"	5 1/16"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
4	4 1/8"	3	3 1/8"	6 1/32"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000

Straight Reducing Adapters, Male Press-Connect Tube × Female Press-Connect Tube

Tube Connection (Male)		Tube Connection (Female)
Copper Tube Size	Tube OD	Copper Tube Size	For Tube OD	Lg.	Material	Specifications Met		Each
3	3 1/8"	1 1/4	1 3/8"	5"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000
3	3 1/8"	1 1/2	1 5/8"	5 11/32"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3	3 1/8"	2	2 1/8"	4 9/16"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3	3 1/8"	2 1/2	2 5/8"	4 29/64"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
4	4 1/8"	3	3 1/8"	6 9/64"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000

90° Elbow Adapters, Male Press-Connect Tube × Female Press-Connect Tube

Tube Connection (Male)		Tube Connection (Female)
Copper Tube Size	Tube OD	Copper Tube Size	For Tube OD	Material	Specifications Met		Each
3	3 1/8"	3	3 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000

90° Elbow Connectors, Female Press-Connect Tube

Copper Tube Size	For Tube OD	Material	Specifications Met		Each
3	3 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000

45° Elbow Adapters, Male Press-Connect Tube × Female Press-Connect Tube

Tube Connection (Male)		Tube Connection (Female)
Copper Tube Size	Tube OD	Copper Tube Size	For Tube OD	Material	Specifications Met		Each
3	3 1/8"	3	3 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000

45° Elbow Connectors, Female Press-Connect Tube

Copper Tube Size	For Tube OD	Material	Specifications Met		Each
3	3 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000

Inline Tee Adapters, Female Press-Connect Tube × Female Threaded Pipe

NPT Threads
Copper Tube Size	For Tube OD	Pipe Size	Material	Specifications Met		Each
3	3 1/8"	3/4	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000

Tee Connectors, Female Press-Connect Tube

Copper Tube Size	For Tube OD	Material	Specifications Met		Each
3	3 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000

Inline Tee Reducers, Female Press-Connect Tube

Tube Connection (A)		Tube Connection (B)		Tube Connection (C)
Copper Tube Size	For Tube OD	Copper Tube Size	For Tube OD	Copper Tube Size	For Tube OD	Material	Specifications Met		Each
3	3 1/8"	1/2	5/8"	3	3 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000
3	3 1/8"	3/4	7/8"	3	3 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3	3 1/8"	1	1 1/8"	3	3 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3	3 1/8"	1 1/4	1 3/8"	3	3 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3	3 1/8"	1 1/2	1 5/8"	3	3 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3	3 1/8"	2	2 1/8"	3	3 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3	3 1/8"	2 1/2	2 5/8"	3	3 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
4	4 1/8"	3	3 1/8"	4	4 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000

Right-Angle Tee Reducers, Female Press-Connect Tube

Tube Connection (A)		Tube Connection (B)		Tube Connection (C)
Copper Tube Size	For Tube OD	Copper Tube Size	For Tube OD	Copper Tube Size	For Tube OD	Material	Specifications Met		Each
2	2 1/8"	2	2 1/8"	3	3 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000
2 1/2	2 5/8"	2 1/2	2 5/8"	3	3 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3	3 1/8"	3	3 1/8"	1 1/2	1 5/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3	3 1/8"	3	3 1/8"	2	2 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3	3 1/8"	3	3 1/8"	2 1/2	2 5/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3	3 1/8"	3	3 1/8"	4	4 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000

Dual Tee Reducers, Female Press-Connect Tube

Tube Connection (A)		Tube Connection (B)		Tube Connection (C)
Copper Tube Size	For Tube OD	Copper Tube Size	For Tube OD	Copper Tube Size	For Tube OD	Material	Specifications Met		Each
3	3 1/8"	2	2 1/8"	2 1/2	2 5/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	0000000
3	3 1/8"	2 1/2	2 5/8"	2	2 1/8"	Copper	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
4	4 1/8"	2	2 1/8"	3	3 1/8"	Copper	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