The 7100 spherical metal grommet firewall fitting has a 1 inch steel ball held in place by 2 4130 steel pressure plates. It has a swivel angle up to 50 degrees from straight and is held onto the firewall by 2 steel blind rivets. Assembly weighs only 1.3oz-2oz (.08lb-.125lb) depending on ball hole size.
Meets FAR 23.1191 and AC 20-135 requirements.
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