Pull/Push Valve replacement for Apollo VA-52

I am looking for a replacement for the backwash push/pull valve on my Apollo VA-52.  The existing push/pull is brass and made by Val-Pak, resembles this one: http://www.inyopools.com/pool_parts_anthony_push_pull_valve.aspx

What are my replacement options?  The filter input/output lines look to be 9" OC, 1.5" I think.  I’m fine going with a PVC option.

We were unable to find a push-pull valve that will work with the Anthony Apollo filter. There may be another option. We have a multiport valve that isn’t pre-plumbed. This type of valve can be adapted to work with a variety of filters. The valve for 1.5" plumbing is part number 4700P.

We discuss this type of valve in one of our Poolside Chat episodes.