Q.C. SOCKETS & PLUGS - LEGACY - BRASS & STEEL Pacific Bay Equipment Sale! Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Brass Coupler, designed for 4000 PSI and extended durability. Affordable and rugged all in one. PSI Max: 4000 Precision Brass Design Stainless-Steel Band for Increased Durability (Except 1/2") Unrestricted Free-Flow Ranges by thread size If you need help finding the correct size, give us a call!