View cart “591-09 O 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 591-23 Replacement Fluid Needle Spring $5.95 Add to cart 591-01 Retaining Ring $14.95 Add to cart 591-08 Side Port Control $12.95 Add to cart 591-31A Air Inlet Assy. $9.95 Add to cart