View cart “591-41 Packing Screw” has been added to your cart. 591-26A Air Valve Assy.$19.95 591-26A Air Valve Assy. quantity Add to cart Category: TB591 Adhesive Spray Gun Description Description Replacement Air Valve Assembly Related products 591-43 Trigger $6.50 Add to cart 591-41 Packing Screw $2.50 Add to cart 591-40 Packing $3.50 Add to cart 591-14A Air Bushing Assy. $36.95 Add to cart