The front floors on the WWII Jeeps have a drain fitting on the left and right and these are threaded ¼ NPT to accept plugs.
The correct plugs are ¼ NPT slotted, early were brass and later steel and often Cadmium Plated.
Ref: Willys TM-10-1186 – Change No1 July 1, 1943.
The GPW part number is FM-358019-S
This is the correct slotted plug. Square headed plugs are not correct.
Below is a picture of an original floor with the correct plug fitted.
The plugs were installed as shown from the top down using the screw driver in the Jeep Tool kit. This allowed for the plugs to be installed without leaving the vehicle.
Do not install the plugs from underneath the vehicle as they can be dropped and easily lost.
Original Jeep publications call for the plugs to be stored in the glove box although where the Slat Grille Jeeps without Glove Box had them stored is unknown.
M.V. Spares has been manufacturing parts for WWII Jeeps for more than 40 years as well as having restored over 50 Willys MB and Ford GPW Jeeps. Experience we are pleased to pass on to our customers.