VEVOR Roofing Hot Air Welder, 3400W 220V High Power Plastic PVC TPO Welding Machine - 1.57in Welding Width, 0.04-0.08 in Thickness, 68 ?-1202 ? Heat Roofing Welding Tool, for Waterproofing Advertising is up for auction in Tools & Home Improvement. The current bid is $367.00, 92% below the $4500.00 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.