View cart “591-06 Lock 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 591-08 Side Port Control $12.95 Add to cart 591-42 Retaining Ring $3.50 Add to cart 591-39 Fluid Connector $9.95 Add to cart 591-03 Fluid Nozzle $29.95 Add to cart