Apologies if this is a bit of a noob question, but:
My mum has a Honeywell TRV on her radiator which has sheared off at the plastic fitting - here's whats left:
Here's the fitting it came out of - a female locking ring:
I bought what I *thought* was a suitable replacement which would allow me to fit the new TRV without any fannying around with the water system itself. Here's what I bought:
Problem is that valve has a female locking ring built onto the valve itself, which mates to a male elbow valve. I need the opposite fitting. Are these still available or do I have to drain down the system and fit the new male elbow which came with my screwfix purchase?