1. Height optional from 8" to 12" 
2. One piece float cup, saving space 
3. It ensures water in and out steadly and won't get struck 
4. Refill rate is optional.
5. Prevent water from flowing backwards. 
6. G1/2"(T1202B) thread which could be switched to G3/8"(T1202A) or 15/16"(T1202C) by adapter 
7. Inside filter(two optional) keeps impurity out of valve and easy to clean.