Quick question - Sika flow switch o ring size

[WHPES]

As the title says, please can anyone tell me what is the size of the o rings in the sika flow switches. My guess is 17mm x 3.5mmm but I would like to be sure before I order a load.

 

[WHPES]

Anyone got a Sika switch on their van? Please can you measure the o-ring?

 

[dancinplumba]

22 outer dia, 13 inner, 4.5 thickness
🙂