The Heavy Duty Spring Valve NRV Set is a premium-quality replacement kit designed for HTP 30L and 50L Power Sprayer Pumps. This set of six non-return valves ensures reliable pressure retention, smooth chemical flow, and prevention of backflow during spraying operations. Made from high-grade stainless steel and durable plastics, these valves are built to withstand high pressure, chemical exposure, and repetitive use. Each valve provides excellent sealing capacity for enhanced pump efficiency and reduced maintenance downtime. Ideal for professional agricultural and horticultural spraying, this NRV set maintains operational consistency and ensures prolonged pump performance. Perfect for farmers, technicians, and sprayer maintenance professionals seeking high-quality replacement parts for power sprayers.