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View Full Version : Replacing A Large Rotor With A small One Question


MEXANDME
08-17-2011, 12:18 AM
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!!!

Thanks,

Mex

WalkGood
08-17-2011, 12:34 AM
Bushing.

Funny pipe swing joint.

mitchgo
08-17-2011, 12:44 AM
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

mitchgo
08-17-2011, 12:52 AM
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 :)

Kiril
08-17-2011, 03:03 AM
http://www.hunterindustries.com/products/miscellaneous/sjspecs.html

Sprinkus
08-17-2011, 09:49 AM
3/4 fipt x 1/2 mipt riser extension. (IPT adapter)
Spears #446-074 (http://etnasupply.com/index.jsp?path=product&part=40916&ds=dept&process=search&qdx=0&ID=,Pipe...Tube.Fittings,Pipe.Fittings,Plastic.Fittings...Pvc.Schedule.40...80)

If 3/4" female in ground then use a 3/4" x 1/2" reducing nipple.

DanaMac
08-17-2011, 09:57 AM
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.

AI Inc
08-17-2011, 11:55 AM
Replace it with a 5000, throw the 3500 in the trash where it belongs.

MEXANDME
08-17-2011, 12:35 PM
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,

Mex

DanaMac
08-17-2011, 12:41 PM
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.

koster_irrigation
08-17-2011, 07:29 PM
We cut the elbow off. No bushing or adapters.

I do keep 3/4x 1/2" thread by thread adapters if the need arises.

The latest generation of 3500's with the rubber cover are holding up for us pretty well. We go through a couple of cases a month.

greenmonster304
08-17-2011, 07:55 PM
We cut the elbow off. No bushing or adapters.

I do keep 3/4x 1/2" thread by thread adapters if the need arises.

The latest generation of 3500's with the rubber cover are holding up for us pretty well. We go through a couple of cases a month.

I recently installed about 8 of those and I was pleased how they worked but I wasn't expecting much. They seem to be way better than the hunter mini rotor.
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