Silicone Tube 3mm ID x 4mm OD

This flexible silicone tube, with a 3mm inner diameter and 4mm outer diameter, is a versatile hose for pumps, aquariums, air lines, water lines, and DIY fluid projects. The 1.5mm wall gives a good balance of flexibility and strength, so the tube bends easily around corners without kinking and keeps its shape under normal low-pressure use.

Made from soft silicone rubber, it handles a very wide temperature range, from about -20°C up to 150°C. That suits hot water lines, heater connections, and cold environments alike. Silicone also resists weathering, sunlight, and ageing, so the tube stays supple indoors and outdoors where PVC tubing would harden and crack.

The 3mm bore fits standard 5mm barbed fittings and small pump nozzles, and the smooth translucent wall lets you see liquid or air flow at a glance. Typical uses include aquarium air and water lines, peristaltic and diaphragm pump connections, siphoning and draining, hydroponics and irrigation, 3D printer cooling loops, vacuum lines, and protective sleeving for wires and electrical equipment. Cut it to length with a sharp blade and slip it onto the fitting.

Specification:

• Material : Silicone rubber
• Inner Diameter (ID) : 3mm
• Outer Diameter (OD) : 4mm
• Wall Thickness : 0.5mm
• Construction : Unreinforced (low-pressure use)
• Colour : Clear / translucent
• Operating Temperature : -20°C to + 150°C
• Compatible Fittings : 5mm barbed fittings and nozzles
• Applications : Pumps, aquariums, air and water lines, siphoning, irrigation, cooling loops, wire sleeving
• Package Includes : Silicone tube cut to ordered length