Just a thought-I'm reading a lot posts with concerns of the new 40 gpm Hi-flow's potential for damage to older hi-flow attachments. I'm sure you guys are aware that by backing off the throttle, your flow rate goes down. If you have a deluxe panel, you can display engine rpm and with flowmeter, match flow to a specific rpm, and run your attachment without fear of damage. Of course, you may need all the rpms you can get for maneuvering, but that depends on what you're doing. Also, if you have multiple operators and you fear that one may overflow the attachment, you can block his use of hi-flow by password(with deluxe panel, that is) until he is trained to your confidence.