M35a3 oil change - what type o-ring for drain plug?

[Caflin]

I am getting ready to do an oil change on my M35a3. I have the oil and CAT filter ready to go. I reviewed the manual for details on the change. Of course there is an o-ring on the drain plug that the TM should be changed. I looked it up in the 24P manual and searched the NSN online but found no real information on the O-ring (size, material etc).

Can someone provide the details I need to make sure I get the right thing?

 

[jetman10]

I have an A2 and both plugs have copper gaskets which after they were changed still leaked !

 

[Jeepsinker]

Just get an assortment of nitrile orings from harbor freight and find one that fits. No need for viton here.