Next using some Teflon tape around the threads, gently screw the fitting into the T segment and leave the inlet fitting pointing down. One tip I learned the hard way was to connect a 3” length of 1/8” aquarium hose to the brass fitting and feed it up and into the tube to make connection of the bubbler module easy.

Next is to trim the air hose in the pipe to length and connect it to the check valve. Make sure the check valves flow indicator is facing in the up direction when you put this all together or you will be very disappointed.

Next up is to drill a hole in the top cap to allow air to escape. The size of this hole is important to the system and should be no larger than the air inlet tube to maintain a positive pressure in the tube and prevent contaminants from entering (other algae strains for example).

Now we glue it together. Using some silicone (GE Clear Silicone II preferable) place a bead inside the pipe and twist the acrylic tube into the glue while pressing the tube firmly in place. Then place a bead of glue around the top of the pvc tube and smooth using a damp rag or your finger if you don’t mind getting messy… Make sure to remove the plug from the bottom to allow the tube to breath. Silicone products will off gas ammonia and methanol and we don’t want that trapped in the tubes, in rare cases it can rupture your accrylic if air tight. Due to the surface area of the glue joint allow for double the total cure time by the manufactures instructions before filling.