Oil drain plug: Metric Thread???

I want to put an "Easy Drain Oil Kit" on my boat. '76 Southwind with 351w. Skidim has two. One is listed for "older boats" http://www.skidim.com/prodinfo.asp?number=RK024056A which I am assuming is mine. But other sites show metric for my engine. I can't imagine being Metric back in the 70's. Also - I know this hose will not reach my rear drain plug. I figure I can at least drain it into a container and then pump it out with the electric pump I bought that doesn't pump 100% of the oil out thru the dipstick tube. Any thoughts?

I did have that thought. The part comes with 42" of hose, so I thought I would buy it and then replace the hose or splice it to reach the rear end. Thanks

JoeinNY wrote: dont have a drain plug in the center of the boat under the engine? Very nice southwind btw nicest I have seen.

Correct. The only drain is thru the transom. Thanks for the compliment. The PO is an old military/aggie and kept it in pristeen condition. Yours is very nice too. Love your tower!

end of drain kit is pipe tread.Should be easy to build up an extension,or plumb a little giant pump in right there and add hose to discharge side.

Good luck Munday