The WILO Ball and Check valves with rotating flange an optional check valve are designed for isolation of any WILO Star or Stratos ECO series cirulator. The forged brass body and flange provide strength and versatility for any application where a pipe and flange meet. Featurig a hard chrome plated brass ball with reinforced Teflon seats and a blowout proof stem sealed with Teflon (PFTE), actuated by a vinyl coated stamped steel handle. Mounting bolts, nuts, an additional "T" style wing handle are included with each valve. Effective? We call it Pumpen Intelligenz!