3/8-18 NPT Plug w/ thread-in anode (32mm length x 13mm O.D.)

Fits 1994-2009 D2.8L, D3.0L, D3.6L & D4.2L in-line diesel engine heat exchangers

Fits Mercury Racing 850 SCi, 1025 SCi, 1075 SCi & 1200SCi oil cooler housing.