I just finished draining the tank and pulled out the sump to install a waterproof liner to go along with the new hard wood floors and noticed that one of the drain bulk heads is now loose from cutting some PVC and was wondering the best way to prevent it from leaking when refilling the tank. I can't find my bulk head wrench so off to Home Depot I go. Should I look into replacing the entire overflow return and drain or just re tighten and hope the seal is still good?