3/8 Poly Tubing, 500ft Spool, Blue

For higher-flow water treatment connections that also call for clear color identification, this 500-foot spool of 3/8 inch John Guest polyethylene tubing in blue delivers both capacity and convenience. Made from Linear Low Density Polyethylene for cold and intermittent hot water applications, John Guest PE tubing combines broad chemical compatibility with non-contaminating materials, making the larger 3/8 inch size a dependable workhorse in professional installations.

Bigger Bore, Clear Blue Identification

Stepping up to 3/8 inch gives a system noticeably more flow capacity than quarter-inch tubing, ideal for higher-demand RO units, longer runs, and applications where minimizing pressure loss matters. The blue color makes these larger lines easy to identify, supporting tidy, consistent color schemes in busy equipment spaces. John Guest tubing handles a wide range of temperatures and pressures, uses FDA compliant materials, and carries NSF International certification, suiting it to water purification, conditioners, ice makers, and misting systems, with LLDPE construction recommended for cold and intermittent hot water.

• 500-foot spool of 3/8 inch John Guest polyethylene tubing in blue
• Larger diameter for higher flow capacity
• Blue color for clear, consistent line identification
• For cold and intermittent hot water applications
• FDA compliant, non-contaminating, NSF International certified
• Compatible with John Guest Super Speedfit fittings and valves

Blue is a natural choice for marking feed or supply lines, helping installers maintain a clear color logic across a system so the larger 3/8 inch runs are easy to trace and service. Designed for John Guest Super Speedfit push-in fittings, shut-off valves, and virtually all standard tubing connectors, the tubing forms secure, leak-resistant joints without solvents or specialty tools. The push-in design keeps even higher-flow installations fast to assemble and simple to modify when a system is expanded or reconfigured down the road.

Three-eighths-inch tubing is commonly used where greater throughput is required, such as larger RO feed lines, storage tank connections, and supply runs serving multiple outlets. Choosing NSF-certified tubing safeguards the purity of the finished water, avoiding the off-tastes and contamination that lesser materials can cause. With a full 500-foot spool in stock, installers and service techs stay ready for one job after another. Whether you are plumbing a new high-capacity system, upgrading existing lines, or replenishing your shop supply, this blue John Guest polyethylene tubing is a professional-grade choice for organized, reliable, higher-flow water treatment plumbing across every project.