The truck with the Delevan 5850 has 0040 and 2540 nozzles. They are 4 gallon/minute nozzles and they seem to keep the pump from cycling on and off when you are spraying. The 0040 handles all of the roof peaks and the 2540 handles the lower portion of the roof.
The truck with the All Flo pump has a 4 nozzle holder with 0030, 4030, 0060 and 2560 nozzles. I never have a need to change them. I vary which tip I use based on experience. When I want the extra flow I use the 60's and when I want to control the spray more, I use the 30's.
Brian
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Brian Friel The Roof Cleaners llc Oxford PA 19363 610 842 2104