Photo of the day, #348

Hint: it should be cleaned regularly.

Hey there! It's February 2nd! Happy Groundhog day! For those that don't know, Groundhog day is an American and Canadian holiday. People gather around a groundhog's burrow to see whether or not Spring will come early. If it's cloudy and the groundhog comes out of his burrow, spring will arrive early. If it's sunny and the groundhog sees his shadow, he will go back to his burrow and winter will last another 6 more weeks. I'm hoping that Spring will come early. I can't wait to start gardening again! 


Here's today's hint:


a support system
for you and your companion
but it's optional.


What is it?