Bulkhead Connectors from John Guest have connections on both sides and a threaded nut, and are designed to go through cabinets or control panels in beverage and drink dispensing applications. They are available in tube OD 5/32-inch and 1/2-inch sizes. Metric connectors are available in brass and black acetal copolymer, with tube OD sizes ranging from 4mm to 12mm. The Reducing Bulkhead connector comes in tube OD sizes from 3/8- to 1/4-inch. No tools are needed for connecting or disconnecting.
John Guest. www.johnguest.com