John Guest Black 100 ft/roll 3/8 Polyethylene Tube Tubing Drinking Water RO Reverse Osmosis DI Aquarium Pipe LLDPE by John Guest
John Guest Black 3/8" Polyethylene Tubing
100 feet of LLDPE tubing engineered for reverse osmosis, DI systems, and aquarium applications where light-blocking matters
Black tubing blocks light to prevent algae growth in long runs
Algae Prevention
Opaque black LLDPE blocks UV and visible light, eliminating photosynthesis that causes green growth in clear tubing exposed to ambient light
John Guest Compatible
Precision 3/8" OD sizing works perfectly with John Guest push-fit fittings, quick connects, and shut-off valves used throughout RO and aquarium systems
Drinking Water Safe
Food-grade linear low-density polyethylene meets NSF standards for potable water contact, safe for RO product water and DI applications
100 Foot Roll
Full roll length for commercial installs, multiple system builds, or keeping spare tubing on hand without running short mid-project
Works with standard 3/8" quick connect systems
This John Guest 3/8" OD tubing fits all John Guest, APEC, iSpring, Watts, Express Water, and other RO systems using 3/8" quick connect fittings. Compatible with standard push-fit elbows, tees, ball valves, and inline filters. Ideal for product water lines, ice maker connections, aquarium filtration, and deionization system plumbing. Not for high-pressure feed lines, use 1/4" tubing for standard inlet applications.
Zero Light Transmission
Black pigment completely blocks light in exposed runs where clear tubing would grow algae within weeks
Flexible in Cold
LLDPE remains pliable in unheated spaces, easier to route and less prone to kinking than rigid PVC or CPVC pipe
Clean Cuts
Slices cleanly with tubing cutters or sharp utility knife for leak-free seals in push-fit connections
Reusable Fittings
Push-fit design allows disconnection and rerouting without replacing fittings or tubing when layouts change
John Guest Black 3/8" Polyethylene Tubing
100 feet of LLDPE tubing engineered for reverse osmosis, DI systems, and aquarium applications where light-blocking matters
Black tubing blocks light to prevent algae growth in long runs
Algae Prevention
Opaque black LLDPE blocks UV and visible light, eliminating photosynthesis that causes green growth in clear tubing exposed to ambient light
John Guest Compatible
Precision 3/8" OD sizing works perfectly with John Guest push-fit fittings, quick connects, and shut-off valves used throughout RO and aquarium systems
Drinking Water Safe
Food-grade linear low-density polyethylene meets NSF standards for potable water contact, safe for RO product water and DI applications
100 Foot Roll
Full roll length for commercial installs, multiple system builds, or keeping spare tubing on hand without running short mid-project
Works with standard 3/8" quick connect systems
This John Guest 3/8" OD tubing fits all John Guest, APEC, iSpring, Watts, Express Water, and other RO systems using 3/8" quick connect fittings. Compatible with standard push-fit elbows, tees, ball valves, and inline filters. Ideal for product water lines, ice maker connections, aquarium filtration, and deionization system plumbing. Not for high-pressure feed lines, use 1/4" tubing for standard inlet applications.
Zero Light Transmission
Black pigment completely blocks light in exposed runs where clear tubing would grow algae within weeks
Flexible in Cold
LLDPE remains pliable in unheated spaces, easier to route and less prone to kinking than rigid PVC or CPVC pipe
Clean Cuts
Slices cleanly with tubing cutters or sharp utility knife for leak-free seals in push-fit connections
Reusable Fittings
Push-fit design allows disconnection and rerouting without replacing fittings or tubing when layouts change
Description
John Guest Black 3/8" Polyethylene Tubing
100 feet of LLDPE tubing engineered for reverse osmosis, DI systems, and aquarium applications where light-blocking matters
Black tubing blocks light to prevent algae growth in long runs
Algae Prevention
Opaque black LLDPE blocks UV and visible light, eliminating photosynthesis that causes green growth in clear tubing exposed to ambient light
John Guest Compatible
Precision 3/8" OD sizing works perfectly with John Guest push-fit fittings, quick connects, and shut-off valves used throughout RO and aquarium systems
Drinking Water Safe
Food-grade linear low-density polyethylene meets NSF standards for potable water contact, safe for RO product water and DI applications
100 Foot Roll
Full roll length for commercial installs, multiple system builds, or keeping spare tubing on hand without running short mid-project
Works with standard 3/8" quick connect systems
This John Guest 3/8" OD tubing fits all John Guest, APEC, iSpring, Watts, Express Water, and other RO systems using 3/8" quick connect fittings. Compatible with standard push-fit elbows, tees, ball valves, and inline filters. Ideal for product water lines, ice maker connections, aquarium filtration, and deionization system plumbing. Not for high-pressure feed lines, use 1/4" tubing for standard inlet applications.
Zero Light Transmission
Black pigment completely blocks light in exposed runs where clear tubing would grow algae within weeks
Flexible in Cold
LLDPE remains pliable in unheated spaces, easier to route and less prone to kinking than rigid PVC or CPVC pipe
Clean Cuts
Slices cleanly with tubing cutters or sharp utility knife for leak-free seals in push-fit connections
Reusable Fittings
Push-fit design allows disconnection and rerouting without replacing fittings or tubing when layouts change
