Can someone please tell me where I can find the proper end fittings/adapter for this cooler. I believe it's 1.25 pipe thread but is the other end barb or slip or does it even matter as long as it's 1.25?

I would use a slip fitting but it doesnt matter just easier to take off. Use good clamps and it not going anywhere.

What is the correct material to use? Brass, steel, PVC? I boat in fresh water only which is why I even asked about PVC.

if not in salt water, you can use galvanize pipe from your local hardware store.

Most/many of the 3 X 18 coolers have take 1" NPT fittings. You can find a good selection of fittings at CP Products.

Or the hardware store. 1 inch npt brass nipple and cut to length.

Thanks for the input. I'll try the hardware store first.

Here is what your looking for this is the cheapest place to buy them I just bought 6 of them a couple weeks ago

http://www.danamarineproducts.com/Pr...9-7b9f9f67055a

Wow that is a good deal, thanks for the lead..