Unions for Nitric Acid | McMaster-Carr

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48 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.

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.

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.

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).

Union Straight Connectors, Female Socket Connect

Exploded View

For Use With: Acetic Acid (10%), Calcium Chloride, Deionized Water, Drinking Water, Hydrochloric Acid (25%), Nitric Acid (10%), Phosphoric Acid (85%), Salt Water, Sulfuric Acid (75%), Water
Maximum Temperature: 200° 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).

Unions separate into three pieces so you can access your line.

Pipe Size	Socket Depth	Material	O-Ring Material	Schedule	Color	Max. Pressure		Each
1/4	5/8"	CPVC Plastic	Viton® Fluoroelastomer Rubber	80	Light Gray	Not Rated	6826K97	000000
3/8	25/32"	CPVC Plastic	EPDM Rubber	80	Light Gray	Not Rated	6826K611	00000
1/2	15/16"	CPVC Plastic	Viton® Fluoroelastomer Rubber	80	Light Gray	Not Rated	6826K62	00000
3/4	1 1/16"	CPVC Plastic	Viton® Fluoroelastomer Rubber	80	Light Gray	Not Rated	6826K63	00000
1	1 3/16"	CPVC Plastic	Viton® Fluoroelastomer Rubber	80	Light Gray	Not Rated	6826K64	00000
1 1/4	1 5/16"	CPVC Plastic	Viton® Fluoroelastomer Rubber	80	Light Gray	Not Rated	6826K65	00000
1 1/2	1 7/16"	CPVC Plastic	Viton® Fluoroelastomer Rubber	80	Light Gray	Not Rated	6826K66	00000
2	1 19/32"	CPVC Plastic	Viton® Fluoroelastomer Rubber	80	Light Gray	Not Rated	6826K67	00000
2 1/2	1 3/4"	CPVC Plastic	EPDM Rubber	80	Light Gray	Not Rated	6826K138	000000
3	1 31/32"	CPVC Plastic	Viton® Fluoroelastomer Rubber	80	Light Gray	Not Rated	6826K68	000000
4	2 1/4"	CPVC Plastic	EPDM Rubber	80	Light Gray	Not Rated	6826K69	000000
6	3 1/32"	CPVC Plastic	EPDM Rubber	80	Light Gray	Not Rated	6826K21	000000

Union Straight Connectors, DIN Metric Female Socket Connect

Exploded View

For Use With: Acetic Acid (10%), Calcium Chloride, Citric Acid, Formic Acid (25%), Hydrochloric Acid (30%), Nitric Acid (65%), Sulfuric Acid (95%), Water
Maximum Temperature: 170° F
Specifications Met: ISO 15493
Pipe Nipples and Pipe: Use 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).

Unions separate into three pieces so you can access your line.

DIN Size, mm	Socket Depth, mm	Material	O-Ring Material	Color	Max. Pressure		Each
32	24	CPVC Plastic	EPDM Rubber	Light Gray	230 psi @ 72° F	4102N143	000000
50	30	CPVC Plastic	EPDM Rubber	Light Gray	230 psi @ 72° F	4102N145	000000
63	37	CPVC Plastic	EPDM Rubber	Light Gray	230 psi @ 72° F	4102N146	000000

Union Straight Connectors, Female Threaded Pipe

Exploded View

For Use With:
Fittings with EPDM Rubber O-Rings: Drinking Water, Water
All other fittings: Acetic Acid (10%), Calcium Chloride, Deionized Water, Drinking Water, Hydrochloric Acid (25%), Nitric Acid (10%), Phosphoric Acid (85%), Salt Water, Sulfuric Acid (75%), Water
Maximum Temperature: 200° F
Specifications Met: ASTM D1784, NSF/ANSI 61
Pipe Nipples and Pipe: Use Schedule 80 CPVC Plastic
Flanges: Use Class 150 CPVC Plastic

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.

Unions separate into three pieces so you can access your line.

NPT Threads
Pipe Size	Material	O-Ring Material	Schedule	Color	Max. Pressure		Each
3/8	CPVC Plastic	Viton® Fluoroelastomer Rubber	80	Light Gray	Not Rated	4589K71	000000
1/2	CPVC Plastic	Viton® Fluoroelastomer Rubber	80	Light Gray	Not Rated	4589K72	00000
3/4	CPVC Plastic	Viton® Fluoroelastomer Rubber	80	Light Gray	Not Rated	4589K73	00000
1	CPVC Plastic	Viton® Fluoroelastomer Rubber	80	Light Gray	Not Rated	4589K74	00000
1 1/4	CPVC Plastic	Viton® Fluoroelastomer Rubber	80	Light Gray	Not Rated	4589K75	00000
1 1/2	CPVC Plastic	Viton® Fluoroelastomer Rubber	80	Light Gray	Not Rated	4589K76	00000
2	CPVC Plastic	Viton® Fluoroelastomer Rubber	80	Light Gray	Not Rated	4589K77	00000

Union Straight Adapters, Female Socket Connect × DIN Metric Female Socket Connect

Exploded View

For Use With: Acetic Acid (10%), Calcium Chloride, Deionized Water, Drinking Water, Hydrochloric Acid (25%), Nitric Acid (10%), Phosphoric Acid (85%), Salt Water, Sodium Hydroxide (50%), Sulfuric Acid (75%), Water
Maximum Temperature: 200° 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).

Unions separate into three pieces so you can access your line.

Female Socket Connection		DIN Metric Female Socket Connection
Pipe Size	Socket Depth	DIN Size	Socket Depth, mm	Material	O-Ring Material	Schedule	Color	Max. Pressure		Each
1/2	7/8"	20	22	CPVC Plastic	EPDM Rubber	80	Light Gray	230 psi @ 72° F	4589K413	000000
1/2	1"	25	26	CPVC Plastic	EPDM Rubber	80	Light Gray	230 psi @ 72° F	4589K414	00000
1	1 1/8"	32	29	CPVC Plastic	EPDM Rubber	80	Light Gray	230 psi @ 72° F	4589K415	00000
1 1/4	1 1/4"	40	33	CPVC Plastic	EPDM Rubber	80	Light Gray	230 psi @ 72° F	4589K416	00000
1 1/2	1 3/8"	50	36	CPVC Plastic	EPDM Rubber	80	Light Gray	230 psi @ 72° F	4589K417	00000

Pipe Cement for Max. Pipe Size 90 mm

74605A31

Each

000000

Union Straight Adapters, DIN Metric Female Socket Connect × Female Socket Connect

Exploded View

For Use With: Acetic Acid (10%), Calcium Chloride, Citric Acid, Formic Acid (25%), Hydrochloric Acid (30%), Nitric Acid (65%), Sulfuric Acid (95%), Water
Maximum Temperature: 170° F
Specifications Met: ISO 15493, ISO 7-1
Pipe Nipples and Pipe: Use 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).

Unions separate into three pieces so you can access your line.

DIN Metric Female Socket Connection		Female Socket Connection
DIN Size, mm	Socket Depth, mm	Pipe Size	Socket Depth, mm	Material	O-Ring Material	Color	Max. Pressure		Each
16	14	3/8	19	CPVC Plastic	EPDM Rubber	Light Gray	150 psi @ 72 ° F	4102N158	000000
20	16	1/2	20	CPVC Plastic	EPDM Rubber	Light Gray	150 psi @ 72 ° F	4102N159	00000
40	26	1 1/4	32	CPVC Plastic	EPDM Rubber	Light Gray	150 psi @ 72 ° F	4102N163	00000
63	37	2	38	CPVC Plastic	EPDM Rubber	Light Gray	150 psi @ 72 ° F	4102N165	000000

High-Purity PVDF Pipe Fittings for Corrosive Chemicals

Made of PVDF that’s finished to a 12 Ra smoothness, these fittings handle some of the harshest chemicals without leaching contaminants into your line. They won’t accumulate particles and are easy to clean, thanks to their smoothness. Comparable to Kynar, these fittings handle most organic solvents that would dissolve CPVC, and chlorine or nitric acid that would weaken polypropylene. You can use them at higher temperatures than CPVC and polypropylene. These fittings meet UL 94 V-0 and FM standards for flame retardance. They’re also FDA compliant for direct contact with food, and they meet ASTM requirements for dimensions and tolerances.

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.

Union Straight Connectors, Female Socket Fusion Connect

For Use With: Chlorine, Deionized Water, Hydrochloric Acid, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Solvents
Temperature Range: -40° to 270° F
Specifications Met: ASTM D3261, FDA Compliant 21 CFR 177.2510, FM 4910, UL 94 V-0
Pipe Nipples and Pipe: Use SDR 21 PVDF Plastic
Flanges: Use PVDF Plastic

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

Pipe Size	Socket Dp.	Material	Color	Max. Pressure		Each
1/2	37/64"	PVDF Plastic	White	230 psi @ 72° F	5306N44	0000000
3/4	5/8"	PVDF Plastic	White	230 psi @ 72° F	5306N45	000000
1	45/64"	PVDF Plastic	White	230 psi @ 72° F	5306N46	000000
1 1/2	59/64"	PVDF Plastic	White	230 psi @ 72° F	5306N47	000000
2	1 5/64"	PVDF Plastic	White	230 psi @ 72° F	5306N48	000000

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

For Use With: Chlorine, Deionized Water, Hydrochloric Acid, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Solvents
Temperature Range: -40° to 270° F
Specifications Met: ASTM D3222, FDA Compliant 21 CFR 177.2510, FM 4910, UL 94 V-0
Seal Material: Viton® Fluoroelastomer Rubber
Seat Material: PTFE Plastic

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

PVDF Plastic
Pipe Size	Flow Coefficient (Cv)	Vacuum Rating, in. of Hg	Port Type	End-to-End Lg.	Color	Max. Pressure		Each
1/2	12.5	29.92	Full	3 13/16"	White	230 psi @ 72° F	5306N67	0000000
3/4	28	29.92	Full	4 9/32"	White	230 psi @ 72° F	5306N68	000000
1	50.9	29.92	Full	4 23/32"	White	230 psi @ 72° F	5306N69	000000
1 1/2	150	29.92	Full	6 1/16"	White	230 psi @ 72° F	5306N71	00000000
2	230	29.92	Full	6 13/16"	White	230 psi @ 72° F	5306N72	00000000

Socket Fusion Weld Tools

		Each
	5381N067	0000000

Heater Bushings

For Pipe Size		Each
1/2	5381N068	0000000
3/4	5381N069	000000
1	5381N071	000000
1 1/2	5381N072	000000
2	5381N073	000000