Praher 150-010 Ball Valve, Praher, 1-1/2" SlipPraher's unique pinned true single union ball valve design provides for : - user friendly handle operation - union nut load does not transfer onto ball seat, thereby providing user with easy handle operation even if valve not operated for a long period of time. - "below grade - blocked seat flooded suction design" - valve seat will not blow out from static pressure if union nut removed.