Hello everyone, my first time posting but have read advice on the site for years. I'm kind of at a cross-roads with our new filter tank and got tired of Leslie's trying to up sell me on things I didn't need. Long story short, I had a leaking crack on my old american products titan filter, so I purchased a new fns plus to replace it. Disconnecting old filter was easy but I seem to be missing something on connecting the new one. I "think" I know the issue but I'm not sure what parts I need (a simple pvc union or adapter kit). My valve is a Pentair SM-20-2 and I confirmed it's compatible with the fns plus.
I'm not even sure if I'm using the correct terminology, but it seems the union? on my valve is too small to connect to the bulkhead of the new fns plus? I'm hoping I don't have to replace the whole multiport valve or cut out the pvc from the current valve and can find a simple "adapter" for it.
Here's a pic of the pvc from the back of the valve:
and here's a pic trying to connect the pvc/union? from the valve to the new fns filter bulkhead? Seems the threads/bulkhead is too large b/c the ports on the old american products filter were smaller.