Compatible with use for Graco 390 395 490 495 595 paint sprayers Compositon: Main Body is made of Stainless steel materials, better compressive property than any other Black handle made of high quality plastic with high hardness & certain toughness, more durable and safe The thimble parts adopts tungsten ball, the resistance is more excellent than ceramic balls Function: High quality and high cost-effective reflux valve,use the real tungsten ball, whose wear resistance are more excellent than ceramic balls & carbide ball, Manufacturer: Thomegoods