“591-26A Air Valve Assy.” has been added to your cart. View cart 591-41 Packing Screw$2.50 591-41 Packing Screw quantity Add to cart Category: TB591 Adhesive Spray Gun Description Description Replacement Packing Screw Related products 591-08 Side Port Control $12.95 Add to cart 591-42 Retaining Ring $3.50 Add to cart 591-01-1 Air Cap Clip $2.95 Add to cart 591-43 Trigger $6.50 Add to cart