Gas wash bottles have a GL-45 thread on both the Dispersion Tube and Bottle.
The pressure tight connection is made with a GL-45 to GL-45 coupling. This connection eliminates the need for grease and springs. The dispersion tube has removable hose connections that provide safe attachment and removable of rubber tubing.
Supplied complete with Coupling Item #1095-18 and  GL-14 removable hose connections Item #2294-10