I have a trailer far out in the country that has a Thetford Galaxy
toilet in it.  Wouldn't you know - it began leaking badly this past
weekend.  I had no manual of course.  Par for the course.

When I removed the toilet and dismantled it, I discovered that a
little 'box' at the top back was leaking.  I further discovered that
this 'box' had a little spring-loaded 'plunger' having a worn-out
little round gasket was the likely culprit.

Anyway, my hasty solution was to connect the two water lines coming to
and from the box together, thereby by-passing the 'box'.  Viola! No
more leak, and the toilet is back in place and works fine - even
flushes about the same.

My question is - can I leave it this way?  I think the 'box'  is
something called a 'vacuum breaker'. but I am not sure.  If it stays
working fine, it seems a shame to spend money on a replacement part -
especially considering its age ( 20 years).

What does anyone think?

Thanks