Clamp – On Water Flow Meter

No — you drill a single 17 mm (11/16″) hole in a horizontal section of pipe and clamp the meter on with the two stainless steel clamps supplied.

No. These meters must be installed in a horizontal run to read correctly.

It varies by model — from 250 mm upstream on the WM10 up to 750 mm on the WM4. See the table above.

Maximum water temperature 48 °C and maximum line pressure 120 psi, about 830 kPa.

Both litres per minute and gallons per minute, on a dual scale.

Yes — it disassembles easily for cleaning, and the replacement float fits all five models.

Send us your pipe size and normal operating flow and we’ll quote the right model and confirm availability.

A clamp-on paddle flow meter for reading water flow in an existing pipe without cutting it.

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Categories: Flowmeters, Water Pumps

Applications: Aquaponics, LSS, Pond, RAS, Water & Wastewater Treatment

Product Information

Clamp-on paddle-style flow meter for water — no pipe cutting, just drill one 17 mm (11/16″) hole and clamp it on with the two stainless steel clamps supplied
Five models covering 25 mm (1″) to 100 mm (4″) pipe, with ranges from 20 LPM up to 2,200 LPM
Dual scale reads in both LPM and GPM
Must be installed in a horizontal run, with the straight pipe upstream and downstream shown in the table below
Maximum water temperature 48 °C, maximum line pressure 120 psi (about 830 kPa)
Disassembles easily for cleaning, and the replacement float is common to all five models
Made in USA
Sizing: choose the model that matches your pipe size, then check your normal operating flow sits inside that model’s range. A flow sitting at the very bottom of the range reads poorly, so if you are between two models pick the one where your normal flow lands nearer the middle of the scale.

Model	Pipe size	Flow range	Straight pipe upstream	Straight pipe downstream
WM10	25 mm (1″)	20–130 LPM	250 mm	120 mm
WM1	40 mm (1.5″)	80–300 LPM	380 mm	190 mm
WM2	50 mm (2″)	120–550 LPM	500 mm	250 mm
WM4	80 mm (3″)	300–1,300 LPM	750 mm	380 mm
WM5	100 mm (4″)	600–2,200 LPM	Confirm with Fresh By Design	500 mm
All models	—	Dual scale, LPM and GPM	Max 48 °C, max 120 psi (about 830 kPa)	Horizontal mounting only

Do I have to cut into the pipe?

Can these be mounted vertically?

How much straight pipe do I need either side?

What are the temperature and pressure limits?

What units does it read in?

Can it be cleaned or repaired?

How do I get a price?

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