Unions for Fuel Oil | McMaster-Carr

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21 Products

About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

Low-Pressure Press-Connect Stainless Steel Unthreaded Pipe Fittings

For Use With: Air, Ethylene Glycol, Propylene Glycol, Water, Diesel Fuel, Fuel Oil
Maximum Pressure: 125 psi @ 72° F
Specifications Met: ASME B31.1, ASME B31.3, ASME B31.9
O-Ring Material: Fluoroelastomer Rubber
Pipe Nipples and Pipe: Use Schedule 10, 40 Stainless Steel
Flanges: Use Class 150 Stainless Steel

Press these fittings onto stainless steel pipe using a crimping tool for a permanent, leak-tight connection that's faster than threading or welding and doesn't require heat. Fittings have an internal stainless steel gripping ring and rubber O-ring that create a seal when crimped. They are designed to leak if fittings have not been crimped; a colored dot marks the leak path so it's easy to spot unsealed connections. All of these fittings are made of 304 stainless steel to resist corrosion from frequent exposure to water and fuels. They’re often used for water processing lines, heating and cooling systems, and fuel lines. They are comparable to Viega MegaPress fittings.

Fittings meet ANSI/ASME B31 code requirements for use in pressure piping systems.

Straight union connectors separate into three pieces. Unscrew and remove the center nut for quick access to a line.

Straight Union Connectors, Female Press Connect

Straight Union Connector

			304 Stainless Steel
Pipe Size	Socket Dp.	Lg.		Each
1/2	1 1/16"	4 17/32"	3319N171	0000000
3/4	1 3/16"	5"	3319N172	000000
1	1 3/8"	5 11/32"	3319N173	000000
1 1/2	1 7/8"	6 5/8"	3319N174	000000
2	2"	7 19/32"	3319N175	000000

Crimping Tools

Crimping tools seal fittings in less than five seconds. These tools are cordless, so you can take them to any job. Connect the jaw or ring that matches your pipe size to these tools, then pull the trigger to crimp the fitting. The pivoting head lets you access connections from any angle.

	Battery
Voltage	No. Included	Cap., amp-hrs.	Battery Charger Included	Battery Charging Time, min.	Compatible With		Each
18V DC	2	3	Yes	39	Viega MegaPress Viega ProPress Viega ProPress XL-C	2233N106	000000000

Jaw and Ring Sets

Jaw and Ring Set

Jaw and ring sets include three jaws, three rings, and one ring actuator jaw. Jaws are for pipe sizes 1/2 to 1; they fit directly into the crimping tool. Rings are for pipe sizes 1 1/4 to 2; clip the ring around the fitting and use the ring actuator jaw and crimping tool to press the open ends together.

For Pipe
Size	Material	For Manufacturer	For Manufacturer Model No.	Compatible With	Includes	Container Type		Each
1/2, 3/4, 1, 1 1/4, 1 1/2, 2	Stainless Steel, Steel	Ridgid	RP 340	Viega MegaPress	One Ring Actuator Jaw Three Jaws (1/2-1 Pipe Size) Three Rings (1 1/4-2 Pipe Size)	Carrying Case	2233N318	000000000

Low-Pressure Press-Connect Steel Unthreaded Pipe Fittings

For Use On:
EPDM Rubber O-Ring: Ethylene Glycol, Propylene Glycol, Water
Buna-N Rubber O-Ring: Air, Lubricants, Propane, Fuel Oil, Natural Gas, Diesel Fuel
Specifications Met:
EPDM Rubber O-Ring: ASME B31,1, ASME B31.3, ASME B31.9, FM 1920, UL 213
Buna-N Rubber O-Ring: ASME B31.1, ASME B31.3, ASME B31.9, ANSI LC4/CSA 6.32, International Fuel Gas Code
Maximum Pressure:
EPDM Rubber O-Ring: 200 psi @ 72° F
Buna-N Rubber O-Ring: 125 psi @ 72° F
Pipe Nipples and Pipe: Use Schedule 40 Steel
Flanges: Use Class 150 Steel

Crimp these fittings onto steel pipe to form a tightly sealed connection that’s faster than threading or welding and doesn’t require heat. An internal gripping ring and rubber O-ring create a secure seal when crimped. They are designed to leak if fittings have not been crimped; a colored dot marks the leak path so it's easy to spot unsealed connections. These steel fittings are coated in zinc-nickel to resist corrosion, but will rust if frequently exposed to saltwater or harsh chemicals. They are comparable to Viega MegaPress steel fittings.

Fittings meet ASME B31 code requirements for use in pressure piping systems.

Buna-N rubber O-rings hold up to natural gas, propane, diesel fuel, lubricants, and other oils. Fittings with these O-rings are often used in fuel gas systems and air lines. They meet the ANSI LC4/CSA 6.32 standard for fuel gas systems and comply with the International Fuel Gas Code.

Unions separate into three pieces. Unscrew and remove the center nut for quick access to a line.

Union Straight Connectors, Female Press Connect

Union Straight Connector

		Buna-N Rubber O-Ring
Pipe Size	Socket Dp.	Lg.		Each
1/2	0.188"	4 15/32"	3360N364	0000000
3/4	0.188"	4 63/64"	3360N365	000000
1	0.188"	5 19/64"	3360N366	000000
1 1/2	0.375"	6 41/64"	3360N368	000000
2	0.375"	7 11/32"	3360N369	000000

Crimping Tools

	Battery
Voltage	No. Included	Cap., amp-hrs.	Battery Charger Included	Battery Charging Time, min.	Compatible With		Each
18V DC	2	3	Yes	39	Viega MegaPress Viega ProPress Viega ProPress XL-C	2233N106	000000000

Jaw and Ring Sets

Jaw and Ring Set

For Pipe
Size	Material	For Manufacturer	For Manufacturer Model No.	Compatible With	Includes	Container Type		Each
1/2, 3/4, 1, 1 1/4, 1 1/2, 2	Stainless Steel, Steel	Ridgid	RP 340	Viega MegaPress	One Ring Actuator Jaw Three Jaws (1/2-1 Pipe Size) Three Rings (1 1/4-2 Pipe Size)	Carrying Case	2233N318	000000000

Hose Unions for Chemicals and Petroleum

Exploded View

For Use With: Citric Acid, Cutting Oil, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Oil
Maximum Pressure: See table

Access your line without twisting the hose—these unions separate into three pieces. Also known as WECO couplings and hammer unions, they’re made of forged steel that’s tough enough to be tightened with the blow of a hammer. Use them with other connectors that have the same hammer union figure and pipe size.

Note: Pressure ratings are given for static (constant) pressure conditions with no instantaneous increases in pressure.

Steel
Pipe Size	Dash Size	Gasket Material	Hammer Union Figure	Max. Pressure		Each
NPT Female
1	16	__	200	2,000 psi @ 72° F	5634N12	000000
1	16	Buna-N Rubber	206	2,000 psi @ 72° F	5634N15	00000
1 1/2	24	__	200	2,000 psi @ 72° F	5634N13	00000
2	32	__	100	1,000 psi @ 72° F	5634N11	00000
2	32	__	200	2,000 psi @ 72° F	5634N14	00000
2	32	Buna-N Rubber	206	2,000 psi @ 72° F	5634N16	00000
4	64	Buna-N Rubber	206	2,000 psi @ 72° F	5634N17	000000
6	96	Buna-N Rubber	206	2,000 psi @ 72° F	5634N18	000000
8	__	Buna-N Rubber	206	2,000 psi @ 72° F	5634N19	000000