My solar hot water cylinder does not have the usual drain cock on the cold feed. However it has this 15mm compression fitting at the bottom with the small hex fitting on the underside. There is a blanking disc in the compression fitting.
Is this a drain off fitting for the cylinder or something else? I have not seen this set up before, and certainly not the small hex fitting on the compression fitting.
Is this a drain off fitting for the cylinder or something else? I have not seen this set up before, and certainly not the small hex fitting on the compression fitting.