Can I use this for a washing machine installation?

You can do, but there are rather obtrusive. The washing machine supply rairly needs to be turned off, and there are much smaller on / off valves specifically designed for washing machines.

Can it be used as a mains stopcock

I am not a heating engineer, I am an electrical / instrument engineer with a lot of mechanical experience and worked in the water industry. I have asked several plumbers /heating engineers the same question and looked online. Generally they say that it cannot replace a stopcock and would break regulations. However, they cannot find the actual regulation to support their claims. If space permits you can install this type of ball valve on the house side of the main stopcock. This is what I am going to do and then the water supply can be easily turned on and off with a quarter turn of the handle. I am told the main stopcock will always leak if turned on and off regularly as they are not designed for this. I have 3 neighbours whose properties have flooded when they went away because they did not isolate the water supply. I turn the water off when I go away. Hope this helps.

Manufacturer	Pipestation
Package Dimensions	16.9 x 12.8 x 2.9 cm; 200 g
Item model number	50607887501726
Size	1 Pack
Colour	15mm - 1 Pack
Style	15mm
Material	Brass
Item Package Quantity	1
Certification	WRAS
Batteries included?	No
Batteries Required?	No
Item Weight	200 g

Isolation Valve 15mm

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