I have a Trinitron 100HD Pool filter for my in ground pool. The filter
is leaking outside around the filter bulkhead at the return pipe. It
looks like an o-ring or gasket has blown out. Does this have to be
repaird from inside the filter or can I replace the gasket or o-ring
from outside the filter bulkhead? I can't tell from looking at the
drawings of the filter and it's parts.