- Longacre®Magnetic Drain PlugMagnetic Drain Plug by Longacre®. 1/2"-20 oil pan. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured...Traps ferrous particles and keeps them from damaging your equipmentCheck often to spot developing problems$15.08