Thermostat and grommet?

Hi, I wonder if you can help? My washer decided to leak water from the drum. On inspection the thermostat and surrounding grommet had popped out of the casing allowing a major water leak. I don't think there is anything wrong with the parts as I will be attempting to push them back in. What I would like to know is there any special glue or sealant paste required to reposition the items on the drum??

I believe these popped out due to the drum being overfilled which shook them loose.

Cheers