Hep20 tap connector washer

[Tezzer2022]

Hello,
I’ve used the hep20 tap connectors a few years back when I did. C&G plumbing course. I brought a few the other day and in the packet was a loose washer (not the tap flat washer). Can anyone tell me what it is used. I’m using copper pipe btw.
Regards Tezzer

 

[snowhead]

At a guess for use when the tap / fitting your are connecting to does not have a flat face but has a taper to take an olive / compression ring.

 

[ShaunCorbs]

Or they make a compression stop that that’s all plastic and uses a rubber cone for the compression onto the copper

 

[Tezzer2022]

Thanks for the input(s). Makes sense
Regards Tezzer