Positive air shut off

[roxxx]

Positive air shut off. this is what we use in the oil and gas industry, if you wanted to go to hot job sites. They are expensive but a necessity . they use them in drag pulling also if the hitch breaks this is triggered and the motor is shut same as a runaway
This is the type of thing that would make a runaway not a worry ,bit safer than a board. http://www.rodadeaco.com/sitepage/mainfs.htm I have used this particular brand . I do not have any affiliation with them. Just bieng reading about runaways when messing with the pump thought some of you might be able to biuld a not so fancy version. hope it help you

[Begle1]

eBay has aluminum blast gates from 4 to 10 inches from $15.

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... osi_widget

Check out auction number 330145636991.
I don't know why I haven't gotten one yet... Just lazy I guess.