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Date: Sun, 08 Jul 2007 17:42:47 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Sealing AN fittings
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I used 37 degree AN fittings on my radiators.  They aren't sealing 
completely.  The best I've been able to do is limit the leaking to a 
bubble every two seconds with 25psi of air pressure (pressurize the 
system and then dunk it in a tub of water). 

Is it permissible or advisable to use some sort of nylon washer inside 
the fitting to get an airtight seal?