The Watts LF919 RPZ assembly provides robust protection against backpressure and backsiphonage, safeguarding potable water supplies in health-hazard applications. Its compact, modular design incorporates poppet-style check valves with replaceable seats and a bottom-mounted, quarter-turn relief valve for efficient installation and maintenance. All rubber components are chloramine-resistant, and top-mounted test cocks simplify testing in tight spaces. The unit includes a flood sensor (with optional activation kit) to alert facility personnel of relief valve discharge. Constructed with a lead-free copper-silicon alloy body, the LF919 delivers reliable, service-friendly performance for demanding environments.

Technical Specifications

• Size Range: ½″ – 2″

• Materials:

  • Body: Lead-free copper-silicon alloy

  • Discs: Silicone rubber

  • Seats: Replaceable polymer

• Pressure Rating: 175 psi (12.06 bar)

• Temperature Range: 33 °F – 180 °F (0.5 °C – 82 °C)

• Features:

  • Bottom-mounted relief valve for reduced clearance shapes

  • Separate access covers for check valves and relief valve

  • Top-mounted test cocks for ease of testing

  • Flood sensor on relief valve (requires activation kit)