View cart “591-24A Replacement Needle Bushing Assembly” 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 591-42 Retaining Ring $3.50 Add to cart 1 TB-591 Spray Gun $175.00 Add to cart 591-08 Side Port Control $12.95 Add to cart 591-44 Stud $3.50 Add to cart