EZ lube spindle and bearing repack question

RinconVTR wrote:
It takes more effort and pressure to push grease thru a zerk fitting than it does thru the EZlube system!!!!

So what? Either can exceed the pressure the seals can handle. The seals aren't made to withstand much pressure, they're there to keep unpressurized grease in place. The common "10-36" single lip seal, which Dexter specs for the 5.2/6k EZ-Lube axles, is only rated to 10 PSI (based on SKF specs for the seal they cross reference).

I couldn't find any good reference, but you claim to know. How much pressure does it take to push grease through the EZ-Lube system, under what conditions, and what's the source of your information?