Device ID please

Device ID please

Device ID please

I had a look in the HW tank cupboard at a house today where I'm going to fit a bath tap/shower mixer set. I'd need to isolate the HW at the tank and CW at the main stop.

I presume the red Grundfos device is a HW pump to increase pressure.?

I'm mystified by the white plastic body device which has a cable feed. Can someone clue me in please?

by DIYspanner

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