Originally Posted by
Darrell Ward
A leaky bulkhead is not what you want. You may want to replace the gasket. In a pinch, you can remove bulkhead gasket, toss it, and run a heavy bead of silicone at the base of the bulkhead fitting. Install the bulkhead. Some silicone will squish out from the base as you tighten the nut, but it's no problem. Let it cure overnight. I have a 125 gal. that has been running 3 years with no gaskets. The bulkheads are siliconed. When I set up the tank, it was used, and the old gaskets were brittle, so I tossed them. The valves aren't really necessary on the drains, the overflows will only drain as much water as is pumped back into the tank. This is the reason for the overflow boxes. The valves on the returns can be useful for adjusting flow however. If you only use one return pump, you will need to split the return line from the pump into two returns with a tee fitting.