The switches are really great, in many years of boating, only pulled it once (as I went overboard) But DO NOT give them to passengers. If you happens to come out, and you coast away about 1/4 mile, you'll need to go back and rescue them. While you're fumbling around looking for the cap to restart, you may loose you're overboard passenger.

ps; it doesn't matter how much they cost, if you save someone life it will be the cheapest accessory you ever buy!

Here is a copy of hte text from CP Performance web site.
This is the ONLY switch to run IMHO
It could allow you or a passenger to restart the boat without hte lanyard.
I have the KS-22 in my boat for hte twin emgine use.
single is 19 bucks twin is 22 bucks
CHEAP insurance

Part No. : 855-KS-2 Category Brand Name
Electrical - Kill Switches T & H Marine
Saf-T-Stop Cut Off Switch - Single I/O with Coiled Lanyard
For all inboard/outboard, inboard, dual inboard/outboard and dual inboard installations. Meets requirments of existing law covering mandatory use of emergency stop switches. Extra strong cloth covered self-retracting lanyard. Black matte finish for attractive appearance. Mounts in a 1-1/2'' diameter hole. Overall dimensions of switch housing are 2-3/4'' x 2'' and requires 1-1/2'' behind panel. Dual engine switches provide two completely isolated circuits to prevent feedback from on engine to the other.

All the switch does is break the run wire coming off the ignition switch, thats why it will crank but wont fire with the switch pulled.

Thanks for the information!!

I just bought one from here http://www.boatfix.com/ It was under $20 as I recall. It is sitting here on my table. Now if I could only get the boat back from the mechanic, I could install it.

mine will NOT crank with it off