Hose connectors, adapters & fittings

Go by the inner diameter of your tubing: the barb's outer diameter should match it or be slightly larger, so the tube sits tight. Connectors are often given as a range, for example the straight PVDF connector for tubing of 7–9 mm, which is meant for a tube inner diameter of up to 8 mm. Soft tubing such as silicone stretches more easily than hard PVC or PTFE. Under pressure or with hot liquids, always secure the connection with a clamp, such as the worm-drive hose clamps for hoses of 10–16 mm outer diameter.

A hose clamp is the simple, economical choice for a connection you rarely open: it holds the tube firmly on the barb. The worm-drive hose clamps let you set the clamping force with a screwdriver. If you connect and disconnect often, for instance on a chiller, a pump or a shared cooling line, a quick coupling saves time and wear on the tubing. Versions with shut-off, such as the polypropylene quick coupling with shut-off, female, 6.4 mm barb, close automatically when you disconnect, so liquid does not run out.

Match the material to the liquid and the temperature. Polypropylene is fine for water, aqueous solutions and many dilute acids and bases. PVDF resists a much wider range of chemicals and higher temperatures: the straight PVDF connector is rated up to 160 °C. For aggressive solvents or extreme temperatures, PTFE is the most resistant, for example the straight PTFE connector, GL 25, usable from −200 to +250 °C. Brass and stainless steel suit water, compressed air and pressure lines, but check corrosion against your medium. Send us your medium list: sales@luminixhealth.com.

Use an adapter with a ground joint on one side and a hose olive on the other. The joint size must match your glassware, for example NS 14/23 or NS 29/32. A straight reducing adapter with tubing olive and NS 14/23 socket works for in-line connections, a bent adapter with tubing olive and NS 29/32 socket when the tube must leave at an angle. For vacuum lines on a distillation setup, there is the straight vacuum adapter with olive, NS 14/23. More heads and adapters are in distillation heads, adapters and columns.

A hose connector or adapter joins two lines, or steps one bore down to another. The barb diameter has to match the tube, and the thread has to match the stopcock or the bottle. Most leaks are a mismatch here, not a hole in the tube.

Tubing is how a liquid or a gas moves between two vessels without being poured. Silicone stays flexible and survives repeated autoclaving. PTFE resists almost every solvent and is stiff. PVC is the ordinary flexible line for water and for mild aqueous work. The fitting, not the tube, is what usually leaks: the barb, the thread and the stopcock have to match the tube bore. Glass and plastic apparatus around these lines is indexed under ISO laboratory ware.

This shelf belongs to Tubing, hoses & fittings, inside Labware. Luminix Health distributes this range for laboratory use.

The neighbouring shelves are PVC, PTFE & other tubing, Stopcocks & valves, Silicone tubing and Tubing accessories. The category above this shelf is Tubing, hoses & fittings.

Luminix Health distributes this range from the heart of Europe. We deliver across the EU in two to five days if in stock. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. Send a quote request, contact the team, or read who we are. The full brand index is on shop by brand.

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