Gearbox and differential have NPT plugs (tapered pipe threads). Engines have BSPS drain plug (British Standard Pipe Straight thread), and that one needs a sealing washer. At 03:36 PM 3/21/2020, dave via Mgs wrote: >.... >The mga and mgb transmission and oil drain plug >– I’m wanting to get magnetic ones to catch shavings, etc. > >They are ½” npt? >....