Alphacool 65166 G1/4 Bulkhead Coupling Black 21mm

G1/4 Bulkhead Connector for Enclosures

This Alphacool bulkhead coupling provides a G1/4 pass-through for routing tubing through a panel or enclosure wall. It suits custom liquid-cooling builders who need a clean external connection point. The 21 mm mounting hole size matches standard panel cut-outs for this thread type. The Deep Black finish resists peeling thanks to a chromatised surface bonded to the brass body.

Installation Notes and Common Issues

The connector threads into a 21 mm hole and is secured with the supplied lock nut, so only basic hand tools are required. Leaks usually come from an uneven panel surface or an overtightened nut that distorts the O-ring seal. Alignment of the two attached fittings must be checked before final tightening to avoid stress on the tubing runs. The part ships as a single connector without additional fittings.

G1/4 Thread Limits and Flow

The G1/4 thread limits compatibility to components sharing that same thread standard. Inner diameter is optimised for high flow, but maximum flow rate still depends on the tubing and fittings chosen for either side. The connector adds a fixed length to the loop, so available panel depth must accommodate it. No other thread adapters or sealing methods are included.