The Wilden Air Repair Kit, part number 02-9985-20, is a new old stock (NOS) product designed for pumps with a 0.5" piston size. This kit includes essential components to repair and maintain the pump's air section, ensuring optimal performance and durability. The Wilden brand is known for producing high-quality pump parts and accessories, making this repair kit a reliable choice for businesses in the hydraulics, pneumatics, pumps, and plumbing industries. Ta