Campbell 1-1/4 in. D X 1-1/4 in. D MIP Plastic Spring Loaded Check Valve

The Campbell 1-1/4 in. D X 1-1/4 in. D MIP Plastic Spring Loaded Check Valve is a compact, lead-free inline valve designed to protect your piping system from reverse flow. Built from durable plastic and engineered for 1-1/4" lines, this valve combines reliable backflow prevention with lightweight installation flexibility for residential and light commercial projects.

Why this spring-loaded check valve stands out

• Lead-free, plastic construction delivers corrosion resistance and compatibility with potable water lines, reducing maintenance and extending service life in challenging environments.
• 1-1/4" MIP connections provide a simple, seal-tight fit for standard pipe fittings, enabling straightforward retrofits or new installations.
• Spring-loaded mechanism ensures quick response to backflow, closing rapidly when forward flow drops to protect downstream equipment and prevent contamination.
• Pressure-driven activation means the valve opens with forward pressure and reliably seats under reverse or low-flow conditions, maintaining system integrity at all times.
• Maximum pressure 175 psi and maximum temperature 140°F make it suitable for a wide range of water supply and irrigation scenarios without sacrificing performance.
• Vertical mounting support offers installation flexibility in compact layouts, especially where space is limited or specific orientation is required.

Ideal use cases

This valve is well-suited for protecting pumps, water softeners, filtration systems, irrigation setups, and other inline applications connected to 1-1/4" piping. Its corrosion-resistant plastic construction is particularly advantageous in potable water lines, where metal valves might introduce galvanic concerns or require extra maintenance. Use it to prevent backflow in:

• Pump discharge lines and staging tanks
• Residential irrigation manifolds and lawn systems
• Under-sink or utility room water lines
• Filtration and treatment assemblies where backflow protection is essential

Installation and practical tips

Mount the valve in a vertical orientation as recommended, ensuring the flow direction aligns with the forward (opened) position. Use appropriate MIP fittings and sealants rated for plastic components to ensure a watertight connection. Since it’s lead-free, it’s compatible with potable water systems, but always inspect for debris before installation to prevent spring or seat interference. Periodic checks for leaks or unusual noise will help maintain optimal performance over time.

What this means for you

Choosing the Campbell 1-1/4 in. D X 1-1/4 in. D MIP Plastic Spring Loaded Check Valve gives you a reliable, easy-to-install backflow prevention solution that aligns with modern plumbing standards. Its combination of lead-free plastic construction, standard 1-1/4" MIP connections, and a responsive spring-loaded design delivers dependable protection against back-siphonage and contamination, while staying approachable on price and installation effort. If you’re upgrading a system or adding protective flow control to a new build, this valve offers a practical, durable option that meets typical residential and light commercial demands.