Prime-Rite Series Trap Primer Valves

PR-500 & PR-500AUS
Prime-Rite Series Trap Primer Valves
The PPP TRAP PRIMER VALVE is listed by:

  • PPP Model #PR-500AUS is Machined from 360 Corrosion Resistant Brass
  • PPP Model #PR-500AUS Approved to Australian Standards Lic. #WMTS 5200.420



The Prime Rite automatic pressure drop activated trap primer valve will prime up to 2 floor drains with our patented distribution DU-U and DU-4 units.

System operating range is 20 psi minimum to 80 psi (138 to 552 kpa) maximum.

The valve requires a 10 psi (70 kpa) pressure drop across the valve to activate and will deliver a metered amount of water to the floor drain. Trap primer is to be connected to a cold water supply only

Constructed of 360 brass, EPDM E70 O-rings, Dow #7 Silicone, #60 stainless steel mesh screen.

  • No Adjustment Required
  • Automatically Maintains a Constant Water Seal in Floor Drain Traps.
  • This Priming Valve Contains: No Springs, Diaphgrams, and uses #60 Mesh Stainless Steel Screen.

Models PR-500 and PR-500 AUS will prime 1 to 2 floor drains. For priming two drains, the valve must use the PPP patented distribution system.


This valve is designed to be installed on ½” to 1 ½” cold water line, feeding a flush valve or other open and closing valve supply line that is frequently used.

Trap Primer valve makeup line to floor drain is recommended to be a minimum of 12” off the finished floor before a 90° elbow can be installed.

The furthest recommended distance of makeup line is 20’ to the floor drain.

Trap primer make up line must have continuous slope to the floor drain (consult local code requirements).

Install with a shut off valve for servicing on the inlet side and a union connection on the outlet side.

The valve must be installed level.

If using the distribution unit the clear plastic cover must be used.

Do not subject the valve to rough in pressure test.

Recommended installation drawings

Recommended Installation Drawings

Max water delivery is based on pressure drop and fixture unit activity on the system.

PART NUMBER Inlet Outlet
PR-500 1/2" NPT Male 1/2" NPT Female
PR-500AUS 12mm BSP Male 12mm BSP Female
1 N/A N/A
 2  N/A  DU-4/DU-U  

Prime-Rite PR-500


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