Hypertherm Kit:Valve Back-Flow - 128339 by Hypertherm Save -8% $159.86 SKU HYP128339 Hypertherm - SKU HYP128339 Add accessories to hypertherm kit:valve back-flow - 128339. Close Add Your items total will automatically update after adding options or accessories. You can edit your selections in the cart. Select Options & Accessories Quantity Add to cart