The fittings are 1/2" NPT. If you want to use A/N type fittings, you will need to use -12 because the lines are 3/4". I used XRP push lock style hose ends. The return is on the right side at the top, and the supply is on the rear at the bottom. Here's a photo of my tank. The 1/4" hose is a vent, because the tank was pressurizing due to the water getting hot, and balloning out the sides. The cap is vented, but will only vent in, not out.
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