Jonathan,
Are you sure you have the 4mdqx version and not the 4mdq ? They are slightly different and one of them (4mdq) would be more appropriate for your application (pressure rated). Either that...or they improved them over the years.
andestang,
If you plan to buy the LG, just remember to oil the bearings once in a while. They will ensure that the LG will run for a very long time.
Its a solid pump, but its just a little noisy for my cup of tea.
- Victor.
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