John Guest Black 100 ft/roll 3/8 Polyethylene Tube Tubing Drinking Water RO Reverse Osmosis DI Aquarium Pipe LLDPE by John Guest Oil Absorbent Mixed bed provides better polish

Mixed bed provides better polish than layered bed alternatives

standardized against NIST-certified references for guaranteed accuracy

The included post filter uses 3/8 inch quick-connect fittings standard on newer Microline units

Precision pressure regulation at 60 PSI to protect inline filters

John Guest Black 100 ft/roll 3/8 Polyethylene Tube Tubing Drinking Water RO Reverse Osmosis DI Aquarium Pipe LLDPE by John Guest Oil Absorbent Mixed bed provides better polishProfessional Grade Tubing 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 100 ft Roll 3 8" OD LLDPE John Guest WHY IT WORKS 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