Watts TB1156F 1/2 Inch Fast Fill Bronze 0386421 Threaded Union

Original price was: $109.86.Current price is: $87.69.

63 in stock

SKU: 171639 Category:


The Watts TB1156F 1/2 Inch Fast Fill Bronze 0386421 Threaded Union is a pressure regulator specifically designed for filling and maintaining water pressure in hydronic heating systems. Here’s a breakdown of its key features and functionalities:


  • 1/2-inch female union inlet and NPT (National Pipe Thread) outlet: Connects easily to standard plumbing fixtures.
  • High-capacity performance: Fills boiler and piping systems quickly and efficiently.
  • Tight-seating check valve: Prevents water backflow and maintains system pressure.
  • Purge lever: Allows for manual removal of air from the system.
  • Stainless steel strainer: Protects the valve disc from debris.
  • Bronze construction: Durable and corrosion-resistant, suitable for hydronic heating applications.
  • Automatic operation: Maintains water pressure automatically once the boiler is filled.
  • Compact design: Fits easily in tight spaces.


  • Fast boiler filling: Saves time and labor when filling the boiler and piping system.
  • Maintains system pressure: Ensures optimal performance and efficiency of the heating system.
  • Prevents backflow: Protects against water damage and potential system malfunctions.
  • Easy maintenance: The purge lever and strainer simplify cleaning and maintenance.
  • Durable and reliable: Built to last with high-quality materials and construction.
  • Automatic operation: Requires minimal user intervention after initial setup.


  • Residential and commercial hydronic heating systems
  • Boilers
  • Hot water heating systems

Overall, the Watts TB1156F is a versatile and reliable pressure regulator for hydronic heating systems. Its fast filling, automatic operation, and durable construction make it a popular choice for homeowners and professionals alike.

Additional information

Weight 1.7 lbs


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