I'm going to be ordering all the plumbing for my turbo project and am lost on the fittings. I thought that NPT fittings were measured like bolts, but they must be different because I saw a 3/8" NPT fitting at Advance Auto and it sure looked like it had a larger outside diameter than that. The fittings are for a Big 16G. My question is what NPT sizes would I need? My two water holes are 1/2", the oil return hole 7/16", and the oil feed flange I'm going to use is 3/8". Also while I'm at it will -6AN SS hose work alright for my water and oil lines? Thanks.

Here is some helpful info:

http://www.anplumbing.com/thread_npt.html

http://www.anplumbing.com/thread.html

and just good general info here:

http://www.anplumbing.com/tech.html

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So the NPT size is measured by the hole in the fitting? Also info on the hose would be appreciated. Thanks.

Anyone?

take your turbo to home despot or lowes and try out all the npt fittings there till you find the ones that work.

Well I went to Lowe's and was able to get the water line fittings and a fitting to weld to my oil pan for the return. I'm going to have to take a tap & die set and neck down a fitting though. I could find one to fit the 7/16" oil feed hole. I've also got another question and yes I searched. What all fittings will I need for my oil feed line, excluding the one that screws into the turbo? Also will it matter on my water line holes which I use for the feed and which for the return? Again thanks.

bump