I was wanting to put a manual air cut off guillotine that a lot of sled pullers use as a safety per cation but I haven't seen a post for it. Is there a place to by them or any threads on how anyone created a homemade version?

 

Isolation valve off an L-1011 Lockheed Trijet with a mini pneumatic rotary actuator.


Too bad V-bands for it don't exist.

 

I believe engineered diesel makes them, or you could get a exhaust flapper and make a intake for when your pulling. if you want it just to have it, I would spend money other places, as there is no way to make it 100% airtight (to outside dust) unless you use something like begle1 shows...

 

Save yourself some money and buy one here.
http://www.blastgateco.com/

Buy up some springs at a hardware store.

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Oh thanks! thats the other name for them i couldnt think of I just want it in case of run away, better be safe than sorry