3/8 Poly Tubing, 500ft Spool, Blk

When an application calls for higher flow than quarter-inch tubing can comfortably carry, this 500-foot spool of 3/8 inch John Guest polyethylene tubing in black steps up to the task. 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, making the larger 3/8 inch size a reliable choice for demanding water treatment runs.

Larger Diameter for Higher Flow

The 3/8 inch size provides greater flow capacity than standard quarter-inch tubing, making it well suited to higher-demand RO systems, longer runs where pressure loss matters, and applications that benefit from increased throughput. John Guest tubing performs across a wide range of temperatures and pressures, is made from FDA compliant materials, and carries NSF International certification, qualifying it for water purification, water conditioners, ice makers, and misting systems. The robust LLDPE construction outlasts traditional low or medium density polyethylene and is recommended for cold and intermittent hot water service.

• 500-foot spool of 3/8 inch John Guest polyethylene tubing in black
• Larger diameter for higher flow capacity
• For cold and intermittent hot water applications
• FDA compliant, non-contaminating, NSF International certified
• Broad chemical compatibility and pressure suitability
• Compatible with John Guest Super Speedfit fittings and valves

The black color helps installers keep larger-diameter lines visually distinct within a system, supporting clean organization in setups that mix tubing sizes. Designed for use with 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 special tools. That push-in convenience makes even the larger size quick to install and easy to service or reconfigure when a system grows or changes.

Three-eighths-inch tubing frequently appears where higher flow is needed, such as feed lines to larger RO units, connections to storage tanks, or runs that supply multiple points of use. Using quality NSF-certified tubing protects the purity of the water the treatment system produces, avoiding the off-tastes and contamination that inferior materials can introduce. With a full 500-foot spool on hand, installers and service techs are ready for back-to-back jobs without running short. Whether building a new higher-capacity installation, upgrading existing lines, or restocking inventory, this 3/8 inch John Guest polyethylene tubing in black is a professional-grade choice for dependable, higher-flow water treatment plumbing.