Iím a new member and have a question about my manifold on a very old filter. I have an original American Products stainless steel vertical DE grid filer (60 sf) manufactured in (please donít laugh) 1984. My manifold has cracked, and just for kicks I looked for a replacement manifold.
The current version of the manifold being sold for the American Titan filter (now made by Pentair) has an internal air bleed assembly that sticks out of the top of the manifold at an angle and is covered with mesh. Unfortunately, the clearance in the top part of my old stainless steel tank is not enough to accommodate the new manifold with the air bleed assembly.
My original manifold is made of thick plastic and does not have the newer angular internal air bleed tube. However, and this is what is puzzling me, the manifold does have a small plastic tube coming out of the center manifold but it is not covered. (A picture is attached.)
With the stainless steel top attached, the tube will extend up to and possibly touch and may go into the bottom of the external air release valve. What is the purpose of this tube? Since it is uncovered, it seems that it would suck or allow DE or debris to go back into the pool. I have cleaned and removed my filter for 30 years and have never thought much about this tube. Out of habit, I always thought the small tube was supposed to go into the bottom of the external air release valve, but this makes no sense. I wouldnít think anything would go into the bottom of the external valve, which should remain unobstructed so it can do its job and bleed off air in the top of the filter tank. Has anyone seen such a tube in a manifold and if so, what does it do? Is it a 1984 attempt to bleed air internally?
I realize mine may now be obsolete but am curious about the tube in my manifold.