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Thread: Liquidator Installation - Thread size of pump drain plug?

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    Liquidator Installation - Thread size of pump drain plug?

    I have a Hayward Northstar single-speed pump and am getting ready to install a new Liquidator. Does anyone happen to know the thread size on the pump drain plug? The manual exploded view does not give the size. I need to buy a replacement piece with a barb to install the Liquidator output port.
    In-ground plaster pool, ~18,500 gal, Hayward single-speed pump, Pentair 60 sq. ft. DE filter, Polaris 280 robotic cleaner, SPA, heater (seldom used), use Taylor K2006 series test kit

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    Mod Squad Bama Rambler's Avatar
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    Re: Liquidator Installation - Thread size of pump drain plug

    It should be 1/4" NPT.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Liquidator Installation - Thread size of pump drain plug

    That sounds way too small. Just looking at the plug, it looks like 3/4". There are two plugs. One is beneath the basket and the other is at the base of the pump. I'm assuming the Liquidator line goes into the pump housing drain plug, right? If so, it is definitely bigger than 1/4". I just hate to have to take the thing out and take it down to the hardware store, resulting a a large loss of water into the yard. I was hoping to not flood my yard too badly by quickly removing the plug and replacing it with the barbed fixture that has clamped off tubing attached.
    In-ground plaster pool, ~18,500 gal, Hayward single-speed pump, Pentair 60 sq. ft. DE filter, Polaris 280 robotic cleaner, SPA, heater (seldom used), use Taylor K2006 series test kit

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    Mod Squad Bama Rambler's Avatar
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    Re: Liquidator Installation - Thread size of pump drain plug

    Sounds like you don't have any option except to take it out and see what size it is.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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