View cart “591-20 Needle” has been added to your cart. 591-31A Air Inlet Assy.$9.95 591-31A Air Inlet Assy. quantity Add to cart Category: TB591 Adhesive Spray Gun Description Description Replacement Air Inlet Assembly Related products 591-08 Side Port Control $12.95 Add to cart 591-05 Air Ring $5.50 Add to cart 591-24A Replacement Needle Bushing Assembly $29.95 Add to cart 591-23 Replacement Fluid Needle Spring $5.95 Add to cart