One thing you do not want to skimp on is the bulkhead fitting. Cheap ones have a tendency to jump threads when tightening them up, or they crack....Not saying more expensive is better, but stay with a brand that has recomendations, as it seems there is a lot of chinese made crap out there thats caused problems. Try looking in a boat or marine supply, but for best bet, the Savko are used and have a good reputation on being good quality BH's. Aquatic Eco also sells good BH fittings.