1. the use of the most advanced international disk multi-way valve
2. only two dozen parts, small size and easy to maintain
3. have a fairly high degree of stability and reliability
4. the market for the GE and Frank valve head, there are more than 200 parts, difficult to maintain
4. the GE and Frank valve head, there are more than 2 hundred parts, difficult to maintain
5. Frank's valve head, there are more than 200 parts, difficult to repair5.