GHL 2.1 fittings and hookup

Discussion in 'General Equipment, Hardware, Filtration' started by InspectorGadget, Dec 9, 2017.

  1. InspectorGadget

    InspectorGadget Active Member

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    What’s up everyone! A few weeks ago I posted about the type of fittings for a GHL2.1 Doser. I wanted to share the information I have found. As you surly know by now, the GHL 2.1 instruction manual is terrible. The fittings it comes with are junk. They do not tell you what type of lines to use. I originally started with the fitting that came with the Doser. I started with the 2mm to 4mm straight fittings that come with it. I used a 1/4 od 1/8 id type vinyl tubing to my dosing containers. That tubing went into my makeshift containers using a BRS acrylic rod with a murloc bulk head (also purchased from BRS). No one had the answer on what type of fittings you use besides the factory Fittings. I had several air bubbles pop up in my lines. Also, the 1/4” od line did not provide the accuracy as stated by GHL (.1ml accuracy). I purchased a 3/32 silicone line and fittings. The 3/32 fittings fit perfectly onto the Doser lines. I then used a 3/32
    Silicone line to dose into my sump. This made all my dosing pumps to be consistent as seen during calibration.. The fitting I purchased are leak proof barbed fittings. I highly recommend switching to these fittings over the factory fittings. USplastics.com Is where I found the fitting I needed. To attached the 1/4” od lines to the GHL lines, you will need the 5/32 to 3/32’reducer for everything to work. Hope all this helps!

    https://www.usplastic.com/mobile/catalog/item.aspx?itemid=90386

    https://www.usplastic.com/mobile/catalog/item.aspx?itemid=31562
     
    chefjpaul likes this.

  2. reefwiser

    reefwiser LMAS R2R Supporter Reef Squad R2R Excellence Award Article Contributor Partner Member 2018

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    I generally use 3/16 id line for dosing with my dosers as I wanting to keep accurate dosing output. When I used bigger ID line I had to calibrate more often which is not fun. Glad that you found something that fit your needs.
     
  3. d2mini

    d2mini Moderator Staff Member Team R2R R2R Supporter Photo of the Month Award R2R Excellence Award Build Thread Contributor Article Contributor

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    They're standard airline tubing fittings, not junk.
    I've never had a problem with them and i've used both standard airline and the flexible 1/4" water line like we use with RO/DI units.

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    There are fittings you can purchase that transition from the flexible line with a barb to a john guest fitting.
    That's how I transitioned to my dosing containers.
    https://www.amazon.com/John-Guest-Acetal-Copolymer-Fitting/dp/B005XU0SK4?th=1

    [​IMG]
     
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