The Lee Company’s new 187 Zero Leak PRI (Pressure Relief Insert) is the latest addition to Lee’s line of miniature zero leak pressure relief valves. This new valve is ideal for both pneumatic and hydraulic pressure relief applications where zero leakage is needed. The cracking pressure is preset at the factory with capabilities ranging from 20 psid up to 100 psid. The nominal weight is only 1.5 grams. Each Zero Leak PRI is 100% tested and inspected to ensure reliable, consistent performance.