Home Filtration Medical Point-of-Use MTF-TA1/2F : Medical Tap Adaptor 22MM BSPM x 1/2 BSPF 31.2.902
A few manufacturers have a 1/2 external thread to include an anti-splash device, such as Markwik wall mixer range (eg S8200). Tap Thread Size: 1/2" MaleTaps Fitted: External Thread