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Explorer Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street Explorer Forum Covers the Explorer, ST, Sport, Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
That is the PCV for an early 01 and before explorer. You need to remove the assembly and plug the hole with a freeze plug. You should have plastic valve covers which will have the PCV in the rear drivers side cover.