Water purifier valve installation set with male and female thread adapters. - Set includes: Water purifier valve installation set (male thread adapter, female thread adapter, 3 special rings, special adapter) - Sizes: Male thread adapter: P1/2, Female thread adapter: P1/4 - Accessories: 3 cable ties - Ring sizes: 16mm, 17.5mm, 19mm Thank you for viewing. This is a new item, but it has been stored at home for many years.