MSB123
Someone out there put something smart here.
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Santa Barbara Reef Co-Op
That might be what I need to do.Measure the ID of short piece of pvc pipe going into the union with a pair of calipers.(pic 2 looks like a slip union and slip bulkhead connected with a short piece of pipe).
Now you have 2 options.
Take 1/2 the union to a plumbing supply house you can find out what will match it.
Order 1 on amazon or some other internet site. See if it fits. If not order form another site and see if it fits......... repeat until .....
I have tried the store, no luck.