This is a 4" Norwesco 316 Stainless Steel Bolted Bulkhead Tank Fitting, Full Coupling (Double Threaded) 4 Bolt with EPDM Gasket Included. Also known as a 4" bolted tank fitting or a 4" bolted bulkhead fitting, and sometimes as a 4" bolted rhino fitting. This is not a 4" rhino fitting but a similar, much better Norwesco alternative to 4" rhino fittings.
