Galvanized Unions | McMaster-Carr

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54 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.

Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

The galvanized finish on these fittings provides fair corrosion resistance. Fittings are for use in low-pressure applications.

Union connectors separate so you can access your line without unthreading pipe connections. They have a brass gasket that creates a tight seal.

Union Straight Connectors

Exploded View

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 150
Specifications Met: See table
Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
Flanges: Use Class 150 galvanized steel

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material	Gasket Material	Specifications Met		Each
1/8	300 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	Brass	ASME B1.20.1, ASME B16.39, ASTM A197	00000000	000000
1/4	300 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	Brass	ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed	00000000	00000
3/8	300 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	Brass	ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed	00000000	00000
1/2	300 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	Brass	ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed	00000000	00000
3/4	300 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	Brass	ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed	00000000	00000
1	300 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	Brass	ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed	00000000	00000
1 1/4	300 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	Brass	ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed	00000000	00000
1 1/2	300 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	Brass	ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed	00000000	00000
2	300 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	Brass	ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed	00000000	00000
2 1/2	300 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	Brass	ASME B1.20.1, ASME B16.39, ASTM A197	00000000	000000
3	300 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	Brass	ASME B1.20.1, ASME B16.39, ASTM A197	00000000	000000
4	300 psi @ 72° F	150 psi @ 350° F	Galvanized Iron	Brass	ASME B1.20.1, ASME B16.39, ASTM A197	00000000	000000
BSPT Female
1/4	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	Brass	ASTM A197, DIN EN 10226	00000000	00000
3/8	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	Brass	ASTM A197, DIN EN 10226	00000000	00000
1/2	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	Brass	ASTM A197, DIN EN 10226	00000000	00000
3/4	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	Brass	ASTM A197, DIN EN 10226	00000000	00000
1	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	Brass	ASTM A197, DIN EN 10226	00000000	00000
1 1/2	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	Brass	ASTM A197, DIN EN 10226	00000000	00000
2	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	Brass	ASTM A197, DIN EN 10226	00000000	00000

High-Pressure Galvanized Steel Threaded Pipe Fittings

A galvanized finish gives these fittings better corrosion resistance than our plain steel high-pressure fittings. Also known as Pressure Class 3000 fittings, they have excellent strength to handle high-pressure applications.

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

Union Straight Connectors

Exploded View

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: 3000
Specifications Met: ASME B1.20.1, ASTM A105, ASTM B633, MSS SP-83
Pipe Nipples and Pipe: Use Schedule 160 steel

NPT Female
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure		Each
1/4	04	3,000 psi @ 72° F	300 psi @ 360° F	00000000	000000
3/8	06	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000
1/2	08	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000
3/4	12	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000
1	16	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000
1 1/4	20	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000
1 1/2	24	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000
2	32	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000

Medium-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

A galvanized finish gives these fittings fair corrosion resistance. They have the strength to handle medium-pressure applications.

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

Union Straight Connectors

Exploded View

For Use With: Air, Natural Gas, Steam, Water
Pressure Class : 300
Specifications Met: FM Approved, UL Listed, ASTM A197, ASTM A153, ASME B1.20.1, ASME B16.39
Pipe Nipples and Pipe: Use Schedule 80 steel
Flanges: Use Class 300 steel

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/4	600 psi @ 72° F	230 psi @ 550° F	Galvanized Iron	0000000	000000
3/8	600 psi @ 72° F	230 psi @ 550° F	Galvanized Iron	0000000	00000
1/2	600 psi @ 72° F	230 psi @ 550° F	Galvanized Iron	0000000	00000
3/4	600 psi @ 72° F	230 psi @ 550° F	Galvanized Iron	0000000	00000
1	600 psi @ 72° F	230 psi @ 550° F	Galvanized Iron	0000000	00000
1 1/4	600 psi @ 72° F	230 psi @ 550° F	Galvanized Iron	0000000	00000
1 1/2	600 psi @ 72° F	230 psi @ 550° F	Galvanized Iron	0000000	000000
2	600 psi @ 72° F	230 psi @ 550° F	Galvanized Iron	000000	000000

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.

Union Straight Connectors

Exploded View

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

			Galvanized Iron × Galvanized Iron
Pipe Size	Lg.	Max. Pressure		Each
NPT Female
1/2	2 1/4"	250 psi @ 72° F	0000000	000000
3/4	2 1/4"	250 psi @ 72° F	0000000	00000
1	2 1/2"	250 psi @ 72° F	0000000	00000
1 1/4	2 3/4"	250 psi @ 72° F	0000000	00000
1 1/2	2 3/4"	250 psi @ 72° F	0000000	00000
2	3 1/8"	250 psi @ 72° F	0000000	000000

Press-Connect Fittings for Copper Tubing

For Use With: Drinking Water
Maximum Pressure: Fittings compatible with Viega ProPress or Viega ProPress XL-C: 200 psi @ 72° F
Fittings compatible with Viega Pex or Viega PureFlow Press: 100 psi @ 72° F
Temperature Range: 0° to 250° F
Tubing: Fittings compatible with Viega ProPress or Viega ProPress XL-C: Use with K, M, L copper
Fittings compatible with Viega Pex or Viega PureFlow Press: Use with hard polyethylene plastic
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.

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

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

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.

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

Replacement O-Rings

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

Crimping Tools with Six Jaws

Jaws for copper tube sizes ½ to 2 fit directly into the included crimping tool.

			Battery
For Copper Tube Size	For Tube OD	Voltage	No. Included	Cap., amp-hrs.	Battery Charger Included	Battery Charging Time, min.	Compatible With	Specifications Met		Each
1/2, 3/4, 1, 1 1/4, 1 1/2, 2	5/8", 7/8", 1 1/8", 1 3/8", 1 5/8", 2 1/8"	18V DC	2	3	Yes	39	Viega ProPress	EMC 2011/65/EU, EMC 2014/30/EU, IEC 62841-1, UL 62841-1	00000000	000000000