Hey man,
What kind of plumbing did you need to connect to the 1 Inch Drain?? I would like to get rid of my stock valve, which I don't need anymore, because I have one in my control room downstairs.
You need these parts -
It is out of stock on this website, may be able to find it elsewhere!
https://www.marineandreef.com/Red_Sea_Reefer_Pump_Return_Connector_16_mm_42221_p/rrs42221.htm
I used this adapter
https://www.pvcfittingsonline.com/3-4-x-1-sch-80-pvc-reducing-male-adapter-mpt-x-socket-836-102.html
1" gate valve
https://www.bulkreefsupply.com/spears-gate-valve-slip-x-slip-1-46dfb1fd21d4e16401260f54d2b6a88a.html
Video on how to perform the swap