Hypertherm Knob:Cap For .82 Dia Knob Blk - 108591 by Hypertherm Save -8% $3.07 SKU HYP108591 Hypertherm - SKU HYP108591 Add accessories to hypertherm knob:cap for .82 dia knob blk - 108591. 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