'91 Euro F3 bilge drain hole size... for oil drain kit hose

[MaliBlue]

Does anyone have one of these boats or a similar vintage close to them?

I am 300 miles from mine but want to purchase an oil drain kit for it but have read that some boats don't have a large enough hole through the transom to accept the hose. If I order one on-line, I can take it to the boat on my next trip. I didn't even think this would be a potential issue so didn't think to measure it the last time I was there. 

Also, if anyone has any experience with the oil drain kits and can provide any feedback, I would love to hear it. It looks like it is going to be very tough to remove the existing drain plug from the oil pan, may even have to raise the engine off the motor mounts, hope not.

 

[formulaben]

Measure thrice, drill once (after you watch several YouTube videos about drilling into fiberglass & glecoat) and don't forget the 3M 5200.

https://www.ebay.com/itm/Sea-Dog-3-4-Bronze-Garboard-Drain-T-Handle-Plug-520046-1/262049285694?epid=669076706&hash=item3d035ac63e:g:-RoAAOSwuTxV91go

 

[MaliBlue]

@formulaben ... That is awesome!! Thanks for that!