Each tank comes packaged with two brass spigots that need to be installed into the two black bulkhead fittings near the bottom of the tank (the bottom fitting on the 500 gallon tank is already installed). Sometimes it can be easier to do these steps while the tank is laid on its side.
Make sure the black bulkhead fittings are tight. Remember, these fittings tighten counter-clockwise, the opposite of normal. Don't over tighten these. Just get them as tight as you can by hand or with a small wrench. (we do our best to tighten fittings before shipping)
Thread the back of brass spigots (the part pre-wrapped in teflon tape) into the bulkhead fittings. Be very careful not to cross-thread them. Take it slow until you can feel them threading in properly, then tighten them by hand as much as you can. Don't over tighten these either. (installing the bottom valve is best when tank is tipped back or laying down)