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Thread: How to attach a down stream injector?

  1. #1
    Squirt
    Join Date
    Mar 2018
    Location
    Austin, Texas
    Posts
    24

    How to attach a down stream injector?

    So I ordered a GP High Draw, along with a bypass kit from Pressure Tek. Haven't got it yet, but I have a quick question.

    How in the world do I get it hooked up to the pump? My pressure washer is a Simpson alh4240 (4 gpm / 4,200 psi). Temporarily I'm trying to get by with a northern tool injector that I've found nearly impossible to attach properly.

    So my pump from the factory has a down stream injector on there with a 3/8 outlet to plug in my pressure hose. However, when I remove this injector, and try and install the northern tool one, it won't fit. No problem, so I figure I'd run to lowes, northern tool, or Home Depot. No-one has anything that will screw in and allow me to convert it to a different thread.

    I called CAT, and apparently the thread size is a Metric 20.1. With that said, I can't find anywhere local that has what I need to convert it from a m20 to my injectors thread size?

    The only way I've been able to install the northern tool injector is add a 3/8 female qc fitting, and plug it into the factory chemical injector so there's two chemical injectors on there. Obviously that isn't going to fly, so what's next?

    Any ideas?

  2. #2

  3. #3
    Squirt
    Join Date
    Mar 2018
    Location
    Austin, Texas
    Posts
    24
    Quote Originally Posted by dambro3 View Post
    do you have pics?
    Hey bud I was going to update with a photo but I figured it out myself. I just capped off the built in injector. Still couldn't get the GP High Draw to work, turned out I had the wrong tips in! Pulls awesome now!

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