Air Brake Relay Valve Type R12 – World American SSA 065104 is a high-quality Type R12 relay valve designed for heavy-duty truck brake systems. Compatible with NPT-threaded ports and direct replacement for OE-style valves. Port Configuration – Equipped with 4 delivery ports (3/8"), a 1/2" supply port, and a 1/4" service (control) port. NPT thread ensures easy, leak-free installation on compatible air systems. Reliable Performance – Features 4 PSI cracking pressure and supports stable brake actuation under demanding road and load conditions. Ideal for quick response times in air brake systems. Direct Aftermarket Replacement – Replaces OEM units from Bendix, Haldex, Navistar, Automann, Freightliner, Mack, Meritor, Euclid, and others. Designed for exact fit and long-term reliability. Package Contents & Compliance – Includes one R12 relay valve (SSA 065104) in sealed packaging. Meets or exceeds OE standards.