red sea max e170 bulkhead

Hi! I'm brand new to reef tanks. After months of thinking about it, I pulled the trigger when I found a cheap second hand E170 (with the sump upgrade). However I have realised that It doesn't have all the parts original parts, which I'm now working out what I do and don't need. After cleaning...

has anyone found pipes / fittings to fit the red sea max e170 bulkhead? Ive found info on the reefer but dont know if its the same. have all the acrylic to uild my sump / refugium but really need to get the plumbing squared away. ive heard the use 32 mm pipe but when measuring the plug in...