I ordered a bunch of 316 stainless steel plumbing parts from McMaster-Carr and picked up a few from Wolseley. These are the parts I need to connect up the new 4040 RO membrane.

The black piece at the bottom is the end of the 4040 RO housing. In the back is a 1/2" x 2" nipple to a 1/2" 90. This is the permeate outlet. Permeate is the clean water which I give back to the trees by sending it out onto the ground outside of my sugar shack. In the front is a 1/2" x 4" nipple to a 1/2"-1/4"-1/2" reducing T. This one is for a pressure gauge. Next is a 1/2" x 2" nipple to another reducing T. This one is for a pressure transducer. Then another 1/2" x 2" nipple to the Hikelok pressure relief valve. The drain on the valve is where the concentrate comes out. In a normal, domesic household RO system the permeate is what you drink and the concentrate is what you throw away. In a maple syrup system you throw away the permeate and save the concentrate.

With my old system I could take the sugar content from around 3% to around 10%. That makes a big different to your yield over the course of a day.

All the joints were taped with the correct teflon tape.