“591-31A Air Inlet Assy.” has been added to your cart. View cart 591-42 Retaining Ring$3.50 591-42 Retaining Ring quantity Add to cart Category: TB591 Adhesive Spray Gun Description Description Replacement Retaining Clip Related products 591-23 Replacement Fluid Needle Spring $5.95 Add to cart 591-24A Replacement Needle Bushing Assembly $29.95 Add to cart 591-06 Lock Screw $12.50 Add to cart 591-31A Air Inlet Assy. $9.95 Add to cart