Elecro Flow Switch - Elecro Optima Compact 2.0kw & 3.0kw Units - Possible Titan Optima if modified

Elecro Heater spare part - Elecro SP-107-A paddle style flow switch to suit Elecro Optima Compact 2.0 and 3.0kw single phase heaters sold through Australian Spa Parts

Marked PTA10530 (so is SP-107-B which has a shorter paddle)

Overall stem/paddle length 56mm, 12mm wide paddle blade.

*This flow switch can be used to replace elecroSP-107-D that suit Titan Optima range of 3 phase heaters. 
Titan Optima use a flow switch with a paddle 56mm long, with a 6mm wide paddle blade. 
This elecroSPA-107-A paddle is the same length. It could be carefully filed/cut down to 6mm wide to match original (it must not be used wider than 6mm or heater damage could result) It does have a 'snap off' tip on the paddle that is a weak point so care must be taken when cutting down. 
If you choose to modify this paddle, it is at your risk and cannot be returned unless the electrical switch is faulty.