That's right. I bought a 2-MDQ-SC for $40, at a fair.
There is a different version, the 2-MDQX-SC, but you don't want that one, it's a low pressure pump.
It can be difficult to get an exact specification on this pump, because Tecumseh used to make it, until LGPC.com took it over. As far as I've seen, there are actually 14 variations of the same pump out there...
Otherwise, it's actually an excellent pump. It will put out a fair amount of heat though, so ventilation is most definitely required. I'm still working on that.
Mine has a higher wattage rating, but you have to remember that this is a direct-drive/mag-drive hybrid (also known as a true mag-drive), where the shaft drives a magnetic hub, which in turn drives the impeller.
It is extremely quiet, except for a faint hum (60 Hz). With proper mounting, it can be almost silent. One thing though: it's quite large, with an overall length of more than 10 inches, and you have to allow for a barb, and a tube to bend somewhere within the case. On the plus side, it can be mounted in any orientation.
To try to improve the flow, I'll be trying a volute (inlet/outlet part) from a 3-MDQ-SC on it: It has 3/4 connections instead of 1/2. The holes should be the same. I doubt it will improve anything, as the 2-MDQX-SC has the same connections, but with enough restriction from my block, it might turn out to be favorable.
Connections are standard NPT, so you can use PVC parts available at any Home Depot/Lowe's. I used polypropylene barbs (grey), but I would have picked nylon, had I known better at the time: they're shorter, and if you need to use any glue, nylon will be easy, where polypropylene will be next to impossible.
Hose clamps are a must. Thick walled tubing is a must: this pump will collapse thin-walled 1/2 tubing, in a closed loop. I recently switched to 3/4 braided tubing (1 inch OD), but that may have been overkill. I also added washers to the wingnuts that keep the housing together, which is made of glass-filled polypropylene. It will withstand chemicals quite well.
Taking it apart is easy, putting it back together is hard, because you have to align the ceramic shaft just right, and just as you're about to close it, the magnet sucks everything inside. I usually have to try twice before getting it right.
I think that covers it all... PM me if you have any questions!
where the 20R"L"T has about a 4.5 meter head... If you can't (or don't want) the Z series, the regular RLT will do far better than any Eheim or the like. Just make SURE to get the MD and not the WMD.
