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8943692993
Meritor: M85062
This R-12 style relay valve fits dual-circuit tractor and trailer air-brake systems on:
Peterbilt: 03-10042
Williams Controls 118365 Pressure Protection Valve N.C. 8943692993Williams Controls 118365 (also catalogued as WM 778 100) is a 70 PSI air pressure protection valve used on heavy duty truck air systems to prioritize service brakes over secondary air consumers. The valve stays closed until upstream system pressure climbs above 70 PSI, then opens to feed downstream auxiliaries; it re closes when pressure drops back below 70 PSI, ensuring the brake reservoir stays charged. Plumbed via two 1 8 NPT ports and rated to 150
