Hi guys, had the suction control valves replaced last week

Or so I thought

Missus phoned the dealers today as the itemised bill only list 1 SCV, the dealers are being very difficult to talk with over this

I did see a picture on here a few months back, of what the said valves look like but I'm dammed if I can find it now

Does anyone have any ideas if it's common practice to only fit 1 valve, or if the single part itself contains the 2 valves ?