3/8 Poly Tubing, 500ft Spool, Yellow

High flow and high visibility come together in this 500-foot spool of 3/8 inch John Guest polyethylene tubing in yellow, a professional-grade choice for demanding water treatment runs. Produced in Linear Low Density Polyethylene for cold and intermittent hot water applications, John Guest PE tubing offers broad chemical compatibility and non-contaminating materials, qualities that make the larger 3/8 inch size a reliable performer in busy installations.

Greater Flow in Bright Yellow

The 3/8 inch diameter carries more flow than standard quarter-inch tubing, making it ideal for higher-demand RO systems, longer runs, and connections where reducing pressure loss is important. The bright yellow color stands out clearly, helping installers organize and identify larger lines at a glance. John Guest tubing performs across a wide temperature and pressure range, is made from FDA compliant materials, and holds NSF International certification, suiting it to water purification, water conditioners, ice makers, and misting systems, with durable LLDPE construction recommended for cold and intermittent hot water.

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

Yellow tubing is excellent for distinguishing a specific larger-diameter line within a system that mixes sizes and colors, supporting a consistent scheme that keeps feed, product, and drain runs clearly separated. Designed for John Guest Super Speedfit push-in fittings, shut-off valves, and virtually all standard tubing connectors, the 3/8 inch tubing assembles into secure, leak-resistant connections without solvents or specialty tools. The push-in convenience keeps even higher-flow installations quick to build and easy to service or expand as needs change.

Three-eighths-inch tubing is frequently chosen where greater throughput is needed, including larger RO feed lines, storage tank connections, and supply runs serving multiple points of use. Using NSF-certified tubing protects the purity of the treated water, avoiding the off-tastes and contamination that inferior materials can introduce. With a full 500-foot spool ready to go, installers and service techs can keep every project moving without running short. Whether you are building a new high-capacity installation, upgrading existing lines, or restocking your shop inventory, this yellow John Guest polyethylene tubing is a dependable, professional-grade option for organized, higher-flow water treatment plumbing.