Watts Regulator series 53L pressure relief valves are used in residential applications to protect against excessive pressure on domestic storage tanks and tankless water heaters. It consists of a bronze body construction with NPT threaded male inlet and NPT threaded female (drain) outlet connections, stainless steel spring, and test lever.

Used for protection against excessive pressure on domestic storage tanks or tankless water heaters
• Furnished with test levers
• Relieves excessive pressure on storage tanks and tankless water heaters
• Compatible with model 210 gas shutoff valves
  
  

  53L12-175

Caleffi 573016A Backflow Preventer and AutoFill Combination 1/2" Press W/Gauge

Caleffi 573016A

Caleffi 573017A Backflow Preventer and AutoFill Combination 1/2" Press x FPT W/Gauge

Caleffi 573017A

Caleffi 573019A Backflow Preventer & AutoFill Combination W/Pressure Gauge

Caleffi 573019A

Caleffi 573012A Backflow Preventer and AutoFill Combination 1/2" FPT W/Gauge

573012A

Series DuoVent High Capacity Air Vents with Manual Vent Feature 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 female NPT connection, brass cover, air vent with silicone rubber seal, shutter, polyethylene float with valve plug, automatic vent with black cap, and manual vent with red cap. Series DuoVent has a high capacity and high temperature rating and is ideal for use with glycol systems or for use as an anti-vacuum device. Can be disassembled for inspection and cleaning.

Air vent with silicone rubber seal
• Impurities do not usually affect function as maximum float line of water is always lower than the valve seal
• Float is high temperature resistant polyethylene
• Suitable for use with glycol systems
• With manual vent feature
  
  

  Watts Water 590719

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

Watts Water 590712