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Caterpillar 3406E (14
8943692993
Peterbilt: 03-10042
7 (2020 and newer)
bearing bore
Williams Controls 118365 Pressure Protection Valve N.C. Caterpillar 3406E (14Williams 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
