704586/704551 High-pressure paint spray pump repair kit with stainless steel piston and piston rod seals 440 450

Complete Repair Kit: This 2-piece sprayer accessory set includes a stainless steel piston rod and complete sealing washers, providing all wear-prone parts for the 440/450 models, eliminating the need to source separate parts. Leak-Proof Sealing Components: Includes wear-resistant polymer and fluorinated rubber seals that resist paint/thinner, maintaining a tight pressure seal to prevent leaks, pressure drops, or uneven spray patterns. Extended Life: Metal construction with seals (resistant to swelling/cracking) and a long-life piston rod reduces frequent disassemblies, lowering maintenance costs over time. Fit: Allows for direct replacement without modification; quick installation ensures minimal downtime. Durable Piston Rod: Machined from stainless steel with smooth surfaces, resists paint, reciprocating wear, and deformation from rust.