Good luck with the RO Build!
The filter goes into the housing with the rubber seal on the bottom.
Make sure you have the tiny O-rings in your black Vessel caps. they would be in the center port, and there are 2 of them.
The sap leaves your pump and goes into the bottom of the filter housing on the outside port, the center port should have a plug.
The top 2 ports, middle one will be your clean water, permeate, the outside port will be your concentrate. In that top outside port you should have your needle valve and a barbed fitting with a hose leading to your concentration tank, or if you are recirculating, the hose could be going back into the tank you are feeding the RO from.
2022 4x40" RO, Welch 1397 Vac Pump, 3 Guzzler Pumps, Lapierre Releaser, 1100 taps
2021 Twin Baby Boys, Close to 650 taps
2020 Upgraded RO to 2 post and 7GBS Pump. 265 taps
2019 Smoky Lake 2x6 raised flue, Autodraw system, Maple Jet Filter Press, a beautiful new bride to be my sugaring partner :-)
2017 Expanded Sugar Shack, new 2x6 with float box, NEXTgen Maple RO, 250+ taps, still on sap sacks
2016 Sugar Shack, 2x6 evaporator, 160 taps, all on Sap Sacks
2014 110 taps
2013 35 taps