GRACO® Tip Guard Spray Tip Guard, Tip Guard Series, Specifications: 4050 psi Maximum Working Pressure, 7/8 in Thread, For Use With: Project Painter Plus, X5, X7, ProX17 Stand, ProX17 Cart, ProX19 Stand, ProX19 Cart, ProX21 Stand, ProX21 Cart, TRUEAIRLESS or RAC IV Spray Tips