View cart “591-42 Retaining Ring” 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 591-08 Side Port Control $12.95 Add to cart 591-41 Packing Screw $2.50 Add to cart 591-05 Air Ring $5.50 Add to cart 591-32 Air Connector $9.95 Add to cart