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OK my friends, I KNOW you are all curious as to WTF a John Blue 193 Pump is, so I will tell you. It is quite possibly, the baddest roof cleaning pump, on the planet! with a true 19.3 GPM, and capable of 220 psi, it will spray and shoot like no other roof cleaning pump I have ever had. The trouble is this, it must be rinsed as soon as the job is completed. if you allow it to miss being rinsed out quickly one time, it will fail. http://agrimart.net/cds-john-blue-19-3-gpm-poly.../...

Back when I was still able to clean roofs, this pump was what I used. I got from 3 to 6 months out of these before the Apple Sauce took it's toll. I was able to buy them direct from John Blue, back before they became a larger company, and merged with CDC Pumps. They cost me 385.00 each, back then, a small price to pay, IMHO. In fact, all our 3 trucks once were equipped with these, before I got suckered into trading themn out for the UDOR Pumps. That was a Huge Mistake! The UDOR Pumps did not even come close to the performance of these, and they started failing right away. That  was when I discovered and told the roof cleaning world about the air diaphragm pumps we still use today.