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PPP PO-500 Oregon #1 Auto Trap Primer Valve

$69.88 on Amazon.com (as of October 19, 2026, 2:23 PM EST) View details ↗

The PPP PO-500 Oregon #1 automatic trap primer valve is a reliable solution for priming 1 to 4 floor drains in commercial and institutional settings. Designed for seamless integration with PPP’s patented distribution units—specifically the DU-U (single drain) or DU-4 (up to four drains)—this valve ensures consistent performance in plumbing systems with a 20–80 psi (138–552 kPa) operating range. It activates automatically when a 10 psi (70 kPa) pressure drop is detected, delivering a precise, metered burst of water to maintain trap seals without waste.

Built for durability and efficiency, the PO-500 is ideal for high-traffic environments where reliable drain priming is critical. Its automatic operation reduces maintenance needs while ensuring compliance with plumbing codes. Whether retrofitting an existing system or installing in new construction, this valve provides a hassle-free way to keep drains clear and odor-free. Compatible with standard 1/2″ NPT connections, it integrates effortlessly into most commercial plumbing setups.

Operating Pressure Range20–80 psi (138–552 kPa)
Activation Pressure Drop10 psi (70 kPa)
Compatible Distribution UnitsDU-U (single drain) or DU-4 (up to four drains)
Thread Size1/2″ NPT
Can the PO-500 be used with other trap primer distribution units?
No, this valve is specifically designed for use with PPP’s DU-U or DU-4 distribution units only.
What happens if the system pressure falls below 20 psi?
The valve will not activate, as the minimum operating pressure requirement is 20 psi (138 kPa).
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