They are both acceptable,however,the double clapper model will give you an 
unrestricted flow while connecting to both snoots because the clappers swing 
fully out of the way into their respective pockets.Oh yeah,also more expensive.

Lamar Vaughn , SET


---- Doug Hicks <[email protected]> wrote: 
> We have a 90° Siamese double clapper FDC rising vertically from the ground. 
> The double clapper is hinged at the top.   Is there a reason for the double 
> clapper instead of the more common single swinging clapper?  
> 
> Douglas Hicks
> General Fire Equipment Co of Eastern Oregon, Inc
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