Malida 1/4" inch White Fittings Bulkhead Connector Tube Quick Connect for RO Unit (Pack of 5) Go to amazon.com Related posts 10 best bulkhead pipe fittings Feature1/4 inch Bulkhead Connector.1/4" inch Water tube Fittings Bulkhead Connector Tube Quick ConnectClip-Free,Easier installation. Description1/4 inch Bulkhead Connector. Union Elbow Quick Connect RO Water Filter Fitting Apply to Reverse Osmosis Water System and Housing In Line Filters