The Echo sprayer uses a mini centrifugal pump rather than the duplex piston pumps on the other machines. According to the specs, that pump is good for 140 and your pressure is adjustable via engine throttle. Application volume is a max of 1.3 GPM. I really appreciate the high output of the Maruyama for spraying trees. That one is good for 1.9 GPM, enough to drive a tree gun with a 1.5 MM orifice.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738