1-1/2" Standoff Pipe Hanger Supports Two Hole Fits CPVC PVC IPS ABS No Block CPVC Standoff No-Block Pipe Hangers Two Hole Strap. NFPA 13 Compliant strap hanger for mounting plastic pipe to wood. Galvanized steel stand offs pipe strap with #10 hex head screws Suitable for fire protection installations. Eliminates need for blocking.