1.Build-in Ball Valves ,full flow 2.OEM 3.suitable for ... stem designed, this anti-blow-out stem also prevents teampering With the internals of the valve when in the line. The ball valve ... have a double seal with elastic O-RINGS chosen for ... , Greece, Sri Lanka,Syria,Tunisia,Mauritius,Algeria etc. Build-in Ball Valves full flow/1/2" 3/4" 1"