Drayton wiser 28mm x 1mm TRV adaptor

The drayton wiser radiator thermostat only supports modern 30mm x 1.5mm pitch TRV heads. This is an adaptor for older 28mm, 1mm pitch valves. An earlier version using the provided metal fixing ring broke after 3 months of use so this version replaces the whole assembly and fixes to the bottom of the control module.

The fine pitch thread is tapered to improve the chances of getting the threads to mesh.

Printed in PETG which is a bit marginal for the working temperature.