DuraVent 3169 4PVL-WS Stainless Steel Wall Strap. DuraVent is a leader in the venting industry. DuraVent has a large line up of venting products and continues to design safe and efficient venting part and products. This DuraVent 3169 4PVL-WS Stainless Steel Wall Strap features a practical 4" wall offset that distances the vent from the wall. The 6" strap support is compatible with 8" single wall, double, and triple wall lengths of pipe.