Overview VLS series couplings are partiULarly well suited forHeavy-dutyService conditions. The VLS coupler is durable product usingHeavy duty poppet style valves for the sealing mechanism and threads as the mechanical connection. Technical Characteristics Coupling body: zinc plated steel Nipple is zinc plated hardened steel Seals: Nitrile Anti-extrusion rings are Teflon Internal components designed to reduce turULence and handle imULse applications Screw-on system ensures connection under residual pressure Series: VLSHeavy Duty Screw Coupler Available in two sizes: 1/2 and inch. The series VLS couplings are mostly used on off highway applications and are very rugged design making them partiULarly well suited for use in construction equipment under extreme conditions.