We designed these silicone water tool adapters to be very versatile, they are compatible with a large range of setups. This includes the V4 Crucible and V5 Micro Diffuser, allowing them to be used with both 14mm and 18mm female joint water tools! Simply replace the mouthpiece with this part. Being silicone these adapters are very resistant to heat build up so also function well as a mouthpiece.  Compatibility  V4 Crucible V5 Micro Diffuser CUB  Lightning Pen StemPod Si Cooling stem or Stealth Stem  Jet Stream Atomizer  Sai/TAF and New Sequoia - When using a glass mouthpiece  S&B Mighty/Plenty on metal flexi-tube BAKx Metal or Glass Stems/Tubes - May need the included 14mm adapter piece from Lamart to be installed first as shown in the last image.  Vaporizer hose/whip (fits our tubing from Elev8, others may not be compatible)  510 Atomizer setups with the o-ring mounted in the atomizer, not on the drip tip Many others.. These function a little differently to glass adapters. Instead of fitting tightly into the female joint, which would make them difficult to remove and cause them to become stuck in the bubbler instead of staying attached to the atomizer, these act more like a gasket. The water tool sits on top and the silicone tapers away so only a small amount stays in contact with the glass allowing them to form a seal with the bubbler, without getting stuck. This system allows them to work with a wide range of bubblers.  Please do not leave bubblers unsupported on top of this adapter.    Includes 1 x Silicone Water Tool Adapter 14mm and 18mm Compatible  FDA Approved Silicone