Getting a bespoke tank fabricated to fill dead space behind a cargo barrier. Looking at stainless as plastic walls are too thick cutting the litres. I've not played much with fittings before so I'm looking for recommendations on best fittings for the tank. Should I use male or female connectors welded on the tank? My inlet will be 1.5 inches and outlet and breather 3/4 inches. Another thought for the inlet was a 1.5 inch pipe instead of a connector. I can't see pros and cons so thought I'd ask people who know more about the plumbing. The tank filling will be via a metre long flexible hose into the inlet.