Mine doesn't have the center white pvc? The two barbs are air intakes,...I put a little piece of tubing and a valves to further adjust the bubbles sometimes mine wants to overflow and the gatevalve won't stop it unless I shut the air intakes back some plus the help to fine tune the skimmer once you get it to "kick in".
I knocked my first clear chamber from the black base one time when I was cleaning it in the laundry tub,...I used clear silicone to reattach it,...its been fine for years. Weldon would have been better but the clear collection area really don't have much pressure. The black tower pipes are the business end of the skimmer,...so Weldon would be a must. I have had mine for over 20 years,...I'm sure you will be happy with it when you get it together. How big is your system going to be?
I knocked my first clear chamber from the black base one time when I was cleaning it in the laundry tub,...I used clear silicone to reattach it,...its been fine for years. Weldon would have been better but the clear collection area really don't have much pressure. The black tower pipes are the business end of the skimmer,...so Weldon would be a must. I have had mine for over 20 years,...I'm sure you will be happy with it when you get it together. How big is your system going to be?