Clear PVC Flexible Tube — Oil & Corrosion Resistant Hose Pipe, 4mm–20mm ID

Match the Inner Diameter (ID) to the outer diameter of the fitting, nozzle, or rod it will slide over. For example, a 4mm ID tube fits snugly over a 4mm barb fitting. If you need a loose slip-fit, choose the next size up. Wall thickness on these tubes is generally 1–2.5mm depending on the size selected. As a quick reference: 6mm ID ≈ 1/4", 10mm ID ≈ 3/8", 16mm ID ≈ 5/8", 20mm ID ≈ 3/4".

Clear PVC flexible tubing of this type is generally rated for low-to-medium pressure applications — typically up to 40–60 PSI depending on wall thickness and temperature. It is not recommended for high-pressure hydraulic lines. Thicker-walled sizes (e.g., 20×25mm) will generally handle more pressure than thinner-walled smaller sizes. Always verify your specific application requirements before use.

Standard clear PVC tubing is generally not UV-stabilized and may yellow or become brittle with prolonged direct sunlight exposure. For outdoor installations, consider shielding the tube from direct UV or routing it through conduit. Short-term outdoor use in sheltered areas — such as under a deck or inside a greenhouse — is typically fine.

This tubing is designed with oil and corrosion resistance, making it suitable for water, light oils, fuels, and many mild chemicals. It is generally not recommended for strong solvents (e.g., acetone, MEK), concentrated acids, or aromatic hydrocarbons. Always test compatibility with your specific fluid before full deployment, especially in critical or enclosed systems.

The flexible PVC material allows the tube to stretch slightly over barb fittings for a secure push-fit connection. For a more permanent or leak-resistant seal, use a hose clamp sized to the outer diameter (OD) of the tube. The tube can be cut cleanly with a sharp utility knife or a dedicated tube cutter. Warming the tube end briefly in warm water can make it easier to slide over larger barbs.

Clear PVC flexible tubing is widely used in aquarium setups for water circulation, air lines, and filter connections. The transparent wall lets you monitor flow and spot blockages easily. Ensure the tubing is fully flushed with clean water before use in a live aquarium environment. The 4×6mm and 5×7mm sizes are commonly used for air lines, while 6×9mm and larger suit water return lines.

Both options are the same tube — the only difference is the cut length. The 1 Metre (≈39.4") option suits shorter runs, prototyping, or replacement sections. The 2 Metre (≈78.7") option is more economical for longer installations or when you need to cut multiple sections from a single piece. If your run exceeds 2 metres, simply order multiple pieces and join them with a straight barb coupler.