Tonysa Water flow meter, 2 point G1 / 4 thread impeller water flow meter, water cooling flow meter suitable for PC water cooling system

When received, the impeller did not rotate freely on the spindle. Fortunately the unit is held together by four screws and has a reusable seal in the form of an O-ring. It was therefore a simple matter to take the cover off, remove the impeller, file away the moulding flash which was causing the problem, and reassemble.It now works perfectly, being sensitive to even low flowrates.