Plug for Sink & Washing Machine Trap?

[Curryman]

Sorry for what must be very simple question.

The plumbing under our sink has a sink/washing appliance trap with a waste hose connection point for 2 appliances. We are only using one of these at the moment. When the appliance runs some foam & waste is ejected via the unused connection, which is a pain.

I've looked at Screwfix, Wickes etc but I can't see an end plug that I can replace the unused 32mm hose connection with. A 32mm push fit doesn't fit (as it is exactly the same size as the fitting - I've tried) and 40mm is clearly too big.

What should get instead to block off the unused connection?

Thanks in advance.

 

[Bahco]

Not seen one but you could change the trap for less than £4 with only one spigot.

 

[kirkgas]

shove some paper in the hole to block it then seal with silicone on the "wet" side, i chuck 3 of these away everyday on the kitchens i'm fitting when we connect the washing machines