Bulkhead fitting that accepts threaded fittings on the wet side and slip on the dry side.
How to Size Bulkhead Fittings - Plumbing Basics, Part 2 - Bulk
Stainless Steel Double Ferrule Bulkhead Unions - 3/4 OD
Slip x barb adapter that makes plumbing with tubing much simpler.
90 Degree Bulkhead Barb Adapter (3/4 Inch)
The flare nozzle reduces the flow velocity and provides excellent spread.
Loc-Line Flare Nozzle Fitting (3/4 Inch)
Lifegard Aquatics R270904 3/4-inch Double Threaded Bulkhead for
Stainless Steel Bulkhead Female Connector, Size: 3/4 Inch (Length
Expel Coral Cleanse - 8oz
Threaded Bulkhead Fitting 3/4
Stainless Steel Bulkhead Fittings - 1