Pneuflex's SPM 06 is 6mm x 6mm hose push-in connectors stainless steel 316 bulkhead union straight push in fitting, designed to connect two 6mm pneumatic tubes through a panel or other barrier and fixed by two bulkheads. 6mm bulkhead union pneumatic fittings utilize stainless steel 316 as a tough steel sheel to withstand the corrosion environment.