Trinitron 100HD Pool Filter Leak

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.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Site Timeline is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.