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Replacing A Large Rotor With A small One Question

Discussion in 'Irrigation' started by MEXANDME, Aug 16, 2011.


    MEXANDME LawnSite Senior Member
    Messages: 396

    For example, replacing a RB 5004 with a RB 3504.

    Any tricks to use in order to not have to replace the 3/4" FP fitting with a 1/2" FP fitting, i.e., some type of bushing, 3/4" female x 1/2" male cut off riser, etc?

    A 3/4" female x 1/2" male MARLEX would be nice!!!


  2. WalkGood

    WalkGood LawnSite Bronze Member
    Messages: 1,910


    Funny pipe swing joint.
  3. mitchgo

    mitchgo LawnSite Silver Member
    Messages: 2,945

    why replace the 5000 series to the 3500 in the first place? :cry:

    When ever I bushing down

    In this instance if you can't cut out the pipe to install 1/2 swing joints then I would use

    3/4 tt coupler
    3/4 x 1/2 tt bushing
    1/2 nipple closed
  4. mitchgo

    mitchgo LawnSite Silver Member
    Messages: 2,945

    Only thing I could find was a 3/4mpt x 1/2 fpt street el which is the opposite.

    I did find a stainless steel 3/4fpt x 1/2 mpt street el for $8 tho :)
  5. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,334

  6. Sprinkus

    Sprinkus LawnSite Silver Member
    Messages: 2,310

    3/4 fipt x 1/2 mipt riser extension. (IPT adapter)
    Spears #446-074

    If 3/4" female in ground then use a 3/4" x 1/2" reducing nipple.
    Last edited: Aug 17, 2011
  7. DanaMac

    DanaMac LawnSite Fanatic
    Messages: 13,219

    Ok - what am I missing here? Isn't it still female thread at the fitting? And female thread at the head? If you are not using swing pipe ells or a swing joint, and are just doing a riser, why won't a 1/2"x3/4" MxM work? Or they make 1/2"x3/4" cut off risers, not that I use these, but they are available.

  8. AI Inc

    AI Inc LawnSite Fanatic
    Messages: 26,976

    Replace it with a 5000, throw the 3500 in the trash where it belongs.

    MEXANDME LawnSite Senior Member
    Messages: 396

    Most of the work that I do is repair / maintenance; not new installs.

    The only time I downsize a rotor is when it should have been a smaller rotor in the first place. I run across many that are too big and chocked all the way down.

    I also change to the smaller rotor if the landscape has changed.

    Thanks for all of the replies. Sprinkus, I ordered some of the Spears 446-074.
    Thanks for the link.

    Thanks again to all,

  10. DanaMac

    DanaMac LawnSite Fanatic
    Messages: 13,219

    Mini rotors are awful. I won't even stock them. Poor reliability, and I hate their spray patterns. I can usually get a 5000 to work with the LA nozzles and knock down the spray. The 3500 also has too much blow-by at the wiper seals, quite often causing the zone to not come up.

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