I found that the lightweight irrigation fittings at the B wearhouse were the best go pricewise, though you may need a hose clip to secure, though with the low pressure involved you could use a cable tie instead, the tank came with inlet and outlet and I tapped a fitting in low for the drain and yes it looks a bit frankenstien. you can get a fitting male thread on end and barb t'other end for your hose, and another fitting, female thread, and use them as a bulkhead fitting, with a bit of silicon.