Patented design for high-integrity joining of HDPE and PVC conduits. Body manufactured from high-density polyethylene; external band clamps and locking rings are stainless steel. Pre-lubricated O-ring provides an air-tight seal (rated to withstand 125 psi). One-person installation; re-enterable; no special tools required. Air- and water-tight with no I.D. reduction; excellent pull-out strength on HDPE, PVC, FRP and steel.