This is an adapter set for a Mitsubishi Chemical Cleansui water purifier. Purpose: Adapters for attaching a water purifier to various types of faucets (aerator faucets, round pipes, etc.). Contents: Includes parts for Set A (for round pipes: 16mm white, 19mm gray), Set C (for internal threads), Set D (for other pipes), and exchange tickets for Sets C and D. However, the W22 and black ring from Set B have been used and are not included. All the parts offered are brand new and unused. Compatible Faucets: Compatible with KVK, GROHE, MOEN, YANMAR, and others. Features: By selecting the appropriate adapter for your faucet's shape, you can attach water purifiers from many manufacturers.