All HART unions are made in USA!

Most Unions are in stock for immediate delivery!

HART Flat-Faced O-Ring Unions allow our customers to slip the "component" in and out of the assembly without disturbing the surrounding tube or rigid pipe sections........ saving downtime and labor!

Customer Benefit: Pipe alignment is much easier with HART O-Ring Unions by eliminating the necessity to spring the line during installation or disassembly!

Female Threaded Unions

The most popular union in the industry for general purpose joining of piping systems.
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Male Threaded Unions

Full flow-waterway bore.
Wrench flats both ends.
Flat faced design.
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Dielectric Unions

Insulated threaded.
Orifice unions.
Steamer unions.
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Socketweld Unions

Full flow-waterway bore
with zero leakage.

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Buttweld Unions

End weld preps machined to match mating pipe.
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Copper Sweat Tubes

Zero leakage.
Flat faced o-ring design.
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Handlebar Unions

Hammer Blow-Lug Nut Unions for superior strength.
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• Turbulence-free fit across seats. Full bore I.D. - Full Flow.  
• O-Ring is located in the threadpiece face, well out of the waterway bore providing added protection against abrasives and erosion.  
• Combination end connections. Threaded, socketweld and buttweld ends are all interchangeable, as well as one-step line size changes.  
• Resistance to vibration. Seals will not loosen, even under extreme vibration or pressure surges.  
• No maintenance needed because once the seal is made, it never requires retightening.  
• Saves money and weight by eliminating unnecessary nipples, bushings, couplings and inserts when initially built into the system.