Review on MASO High End Kitchen Camping Caravan RV Parts & Accessories for Plumbing by Chris Russell

Does not fit available US threads. Based on other comments on similar products, it appears to be BSP (British Pipe Thread) which is not the same as US threads (PT/NPS and BSP threads are not compatible due to different thread forms, not just the fact that most diameter sizes have a different pitch NPT/NPS threads have a 60° included angle and flattened tops and bottoms (this is a form of Sellers thread), BSP threads have a 55° included angle and rounded Top and Bottoms (this is a form of Whitworth update your description and stop selling in the US.