Poly Tubing, Black 5/8" OD x 1/2" ID

This black poly tubing from Hudson Extrusions measures 5/8" OD x 1/2" ID and is a versatile workhorse for water-treatment plumbing, drain runs, and air-injection lines. Sold by the foot and supplied in 100-foot coils, it lets installers cut exactly the length a job needs without paying for excess—equally handy whether you're routing a single short drain line or plumbing out an entire equipment room from one coil.

Where poly tubing earns its place

Flexible polyethylene tubing is a staple of softener, filter, and reverse-osmosis installations across both residential and commercial settings. The 5/8" OD x 1/2" ID size carries meaningful flow for drain-to-waste lines, brine connections, air-pump supply runs, and general utility plumbing, while staying flexible enough to route around tight mechanical spaces and corners without kinking and choking off flow. The black coloration helps resist light, which discourages the algae growth that can take hold inside lines carrying standing water—a practical, real-world advantage over clear tubing for drain and brine duty where cleanliness matters.

• 5/8" outside diameter x 1/2" inside diameter
• Sold by the foot from convenient 100-foot coils
• Flexible polyethylene for easy routing without kinks
• Black color helps resist light and inhibit algae
• Suited to drain lines, brine lines, and air-injection runs
• Roughly 0.04 lb per foot—lightweight and easy to handle

Reliable tubing is one of those small components that quietly determines whether an installation looks professional and stays leak-free over the long run. Properly sized line keeps drain and brine flows moving freely and prevents the backups and slow drainage that frustrate homeowners and installers alike, and quality poly resists the cracking and stiffening that plague cheaper material after a few seasons. Make square, clean cuts so push-fit and barbed fittings seat fully, and allow gentle bend radii rather than sharp corners to keep the bore open. Maintaining an air gap on drain runs protects the system from backflow and satisfies common plumbing-code practice. Pair this Hudson Extrusions tubing with matching push-fit or barbed fittings to complete clean, dependable connections throughout a water-treatment system. For installers and DIYers alike, keeping a coil of 5/8" x 1/2" poly tubing on hand means you're always ready for the next drain run, brine hookup, or air line.