MicroDos dosing pump peristaltic tube Ø4×7mm 155mm with fittings for Ø4×6mm tube - RR.005.001

MicroDos dosing pump peristaltic tube Ø4×7mm 155mm with fittings for Ø4×6mm tube

This is the genuine MicroDos replacement peristaltic tube for the MicroDos dosing pump — the flexible wear element that sits inside the pump head, squeezed progressively by the rotor’s rollers to generate a metered, steady flow of pool treatment chemical. At 155mm in length with an inner diameter of 4mm and an outer diameter of 7mm, it ships complete with pre-fitted end connectors sized for standard Ø4×6mm external PVC tubing, so the assembly drops straight back into service.

What this peristaltic tube does in the MicroDos

In a peristaltic dosing pump the tube is the only part that ever contacts the treatment liquid — whether that is hydrochloric acid to reduce pH, sodium hypochlorite for disinfection, or a pH-raising agent. The rotor compresses and releases the tube in sequence, creating a precise, self-priming flow without any valves or seals exposed to the chemical. When the tube fatigues, flow rate drops and leaks follow; replacing it restores accurate, consistent dosing immediately.

Which MicroDos models it fits

This tube is confirmed for the MicroDos dosing pump range. The Ø4×7mm bore and 155mm cut length are specific to this pump head geometry — do not substitute a tube with different wall thickness, as rotor clearance is critical to flow accuracy. Cross-check your pump’s head markings against these dimensions before ordering if you own more than one MicroDos model.

Signs it needs replacing

Watch for a visible crack, pinhole, or flattened section anywhere along the tube body — these cause immediate under-dosing or a chemical drip inside the pump casing. A gradual unexplained fall in measured pH or ORP in the pool, with no change in setpoint or chemical concentration, often points to tube fatigue before any visible damage appears. Annual replacement during pool opening or winterisation is standard preventive practice.

How to install it

Cut the power to the dosing controller before opening the pump head. Unclip the head cover, lift the rotor clear, and slide the old tube out of its channel. Seat the new tube so both end connectors locate firmly against the head ports, then refit the rotor and close the cover. Reconnect the Ø4×6mm external PVC lines to the pre-fitted fittings — no tools required for the tube itself. Prime the pump with a short manual cycle and confirm flow before returning the controller to automatic mode.