I got a pair at $30. Sounds like a good deal, but I execised the Amazon Prime's free return. The boots felt like cardboard. Heavy and stiff. By the the time they break in they will probably be torn...
I was looking this kit http://www.mscdirect.com/product/details/36409803. This morning the price was $283. A few hours after the coupon email, it was raised to $356. That's blatant.
I think NE414-0580's description matches this one from SPI's site http://www.swissprec.com/cgi/ISSRIT2?pmaka=15-602-6 : 6" length, 0.2" per revolution of the dial. The other 6" NE414-0578 is 0.1" per revolution, matching this one http://www.swissprec.com/cgi/ISSRIT2?pmaka=15-600-0. The...
that could be the unloader valve to help starting the motor. It's usually connecting the pressure regulator/power switch to the check valve on the tank though