BackStop Hydronic ExpansionTanks absorb the expansion pressure in residential or commercial hydronic (forced hot water) heating and cooling systems. Each tank is pressure rated up to 150 PSI and equipped with a carbon steel connection. High-grade, deep drawn steel is used for improved strength to weight ratio. Larger models feature a rugged, stable, base.

Watts Regulator GBV34 Gas Shut Off Valve 3/4" FPT

Watts Water PWMB10M10 Water Filter Cartridge 10 Micron 5 GPM,
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The HAV valve utilizes moisture retaining discs within the body which vary in volume when they change from a wet to a dry condition. As the discs dry, they allow air to escape from the system and when wet, provide a positive shut-off.

• Automatic or manual operation
• Quick venting design
• Positive shut-off ball check
• Heat resistant hand wheel
• Simple two piece construction
• Non adjustable
• Straight mount
• Straight body style

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Watts Water LF600-1/2 Maxi-Flo Silent Check Valve 1/2" FPT Lead Free

Watts Regulator LF70A-T-1/2 Mixing Valve 1.2" FPT 120-160 Degrees Lead Free

Air Gaps for Reduced Pressure Zone Assemblies provide an unobstructed, physical separation between the discharge end of a potable water supply line and an open receiving vessel. The installation of an air gap and drain line are recommended on reduced pressure zone assemblies. Air Gaps can be installed vertically or horizontally.

Watts Water FV-4M1 Series FV-4 Automatic Vent Valves are used in commercial and residential hydronic heating applications to provide automatic air venting for hot or cold water distribution systems. It consists of a brass body construction with male NPT connection, brass cover, air vent with silicone rubber seal, polyethylene float with valve plug, and automatic vent. Series FV-4M1 has a high temperature rating and is ideal for use with glycol systems or for use as an anti-vacuum device. It can also be installed to permit the separation and dispersal of air while fluid is circulating in the system. Can be disassembled for inspection and cleaning.
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Watts Water FV-4M1

Watts Water HP-30PRO-125 Boiler Trim Pack 1-1/4"

Watts Water LF25AUB-Z3 Reducing Valve 1" x 1" FPT x FPT Bronze,
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Watts Regulators series 174A boiler pressure relief valves are used in hot water heating and domestic supply boiler applications to protect against excessive pressures on all types of hot water heating supply boiler equipment. It consists of a bronze body construction with NPT threaded female inlet and NPT threaded female outlet (drain) connections, non-metallic disc-to-metal seating, stainless steel spring, and test lever. Series 174A resists corrosive water conditions, sticking and freezing, and prevents water and sediment from being trapped in the seat. It is designed for emergency safety relief and shall not be used as an operating control.

• Safety relief valves for pressure protection only of all types of hot water heating boiler equipment
• Seat located above drain, water can't be trapped and sediment can't foul seat
• Non-mechanical seat-to-disc alignment will not stick or freeze
• Water seal of high temperature resisting material isolates spring working parts from water during relief

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Watts Regulators series 174A boiler pressure relief valves are used in hot water heating and domestic supply boiler applications to protect against excessive pressures on all types of hot water heating supply boiler equipment. It consists of a bronze body construction with NPT threaded female inlet and NPT threaded female outlet (drain) connections, non-metallic disc-to-metal seating, stainless steel spring, and test lever. Series 174A resists corrosive water conditions, sticking and freezing, and prevents water and sediment from being trapped in the seat. It is designed for emergency safety relief and shall not be used as an operating control.

• Safety relief valves for pressure protection only of all types of hot water heating boiler equipment
• Seat located above drain, water can't be trapped and sediment can't foul seat
• Non-mechanical seat-to-disc alignment will not stick or freeze
• Water seal of high temperature resisting material isolates spring working parts from water during relief

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