... ) effective after-sale service; 3) 3C ISO AIR VENT VALVE Specificationsair vent valves 1.> material:brass 2.> size ... Ltd.specialized in the manufacture of thermostatic radiator valve.We have produced this kind of products ... Poland, Ukraine, England, New Zealand and so on. air vent valves:1. material:brass2. size: 1/2 ... ",3/4",3/8"3. manual air vent4.working pressure:3 bar5.working temperature: < 100 ...