I'm a fairly new Expobar Lever owner and definitely want one of these restrictors! So what is the contact info for the supplier? Has anyone found any generic Home Depot/Lowes type washers that work for this? Would really appreciate help here, I think the Water Department is going to fine me for wasting H20 with all these cooling flushes!

Updating this thread, since I got an office a few weeks ago, and installed a restrictor last night.

First, it was REALLY hard to undo the nuts, to install the restrictor.

Second, Whole Latte Love carries the restrictor, the part number is EX-50020020, I think it was a couple bucks.

I used a 21mm flare wrench to get the group head nut loose. I had a 24mm for the boiler side, but it didn't fit, but I was able to use an adjustable wrench for this end, and got it off OK.
You do need a 21 mm fixed wrench on the group head, not sure if I really needed a flare, but it was $20 shipped for a flare set from ebay, so I just bought the set, I though I needed a 24 too, turned out I didn't.

Tried it this morning, and my cooling flush was reduced by about 1/3 over what it was before this. I need to play with it some more, and I think I am going to reduce my boiler pressure from it's current setting of 1.2bar max.

Randy

Thanks all for such an informative thread. My restrictor arrived from WLL earlier this week and I plan to install it this weekend. First, excuse my stupidity as I have zero experience with plumbing hardware. My opened up Office Lever is shown in the pic. As I understand it, I just need to remove the tube nuts on the boiler and group head ends of the top HX pipe, remove the pipe, put the restrictor into the grouphead, and put it back together, right? Also, just curious, but what is the purpose of that steel box with magnets in it that's covering the boiler-end joint of the HX (with the zip tie on it in the pic)?



Thanks,
Alex

Just don't skimp on the correct wrenches or you will spend $ on knuckle bandaids. The correct size and type of wrench to use is a 21 mm tubing wrench.

You may be able to use those magnets as a "magnetizer" for your collection of screwdrivers. No other machine, from any manufacturer, in any category, has been fitted with these to the best of my knowledge.