Gold Plug Magnetic Sump Plug IP-04X. 1/2 NPT Oil Drain Plug. 1/2 NPT IP04X. Gold Plug manufactures Magnetic Sump Drain Plugs of the highest quality. GOLD PLUG MAGNETIC SUMP PLUG IP-04X. Sump Plug body is CNC machined from 303 stainless steel providing the best quality possible.