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Thread: What is the second hole in skimmer for?

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    What is the second hole in skimmer for?



    I am borrowing this pic from another thread, but my skimmer looks the same. When we closed last week i just plugged the "back" hole, the one with the gizmo in it in this pic. In my skimmer, the back hole is the only one that blew air. It is also the hole that i attach my vaccum to and from what i can tell, the only hole that even functions.

    What is the other one for? I think mine isn't even open if i recall, in other words i think i can see plastic in the bottom of the hole if i recall.
    10,000 gallon
    Viking Freeform Fiberglass Inground Pool. FNS Plus DE Filter Pentair Challenger .75hp pump

    NC KANSAS44

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    duraleigh's Avatar
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    Re: What is the second hole in skimmer for?

    It can be used for several purposes. Most commonly, to connect more than one skimmer in "series" or to connect a main drain to a skimmer. Or, like yours, it can remain plugged and is unused.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: What is the second hole in skimmer for?

    Psst... Dave don't forget it being used as a reserve line (I think I did this so no one else would see it )

    Thinkly, if the other hole had a plug in it already, don't mess with that plug Do you have any reason to suspect that it might do one of the things Dave or I said?
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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    Re: What is the second hole in skimmer for?

    I'm not sure what reserve line means, but I only have one skimmer and my main drains and skimmer come to the pad via different lines. Also the hole i speak of doesn't have a visible "plug" in it. It is recessed, just like the other hole, but if memory serves me correctly, there is plastic covering the hole down a few inches.
    10,000 gallon
    Viking Freeform Fiberglass Inground Pool. FNS Plus DE Filter Pentair Challenger .75hp pump

    NC KANSAS44

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    Re: What is the second hole in skimmer for?

    The second port seems to be unused, so they probably plugged it from the bottom

    The reserve line is just a backup line that is connected to the pool on installation but the poolside ports are plugged and the pipes aren't connected to the filter system (until needed) If the main skimmer line broke or developed a fatal blockage, the reserve line could be opened and plumbed in without the need to dig a lot or break up sections of the deck.
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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    WestSidePool's Avatar
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    Re: What is the second hole in skimmer for?

    I was looking at mine when i was closing my pool, and they capped it off from under the skimmer with a PVC cap.
    When i looked more closely at it, it said 2" on the closed hole, and the open hole (which is being used) said 1-1/2".

    So i'd say its so the installer could run either 1-1/2 or 2" piping to it.
    Eric

    IG 17x33 Grecian - Vinyl Liner (21k gallons), Hayward Pro-Grid DE 4820 filter, Hayward Super Pump, CompuPool SWG CPSC36, TF-100 Test Kit

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