The 4100 series spherical metal grommet firewall fitting has a 1 inch steel ball held in place by 1 4130 steel pressure plate. It requires only one hole in the firewall and has a swivel angle up to 50 degrees from straight. It is held onto the firewall with one 1 5/16 steel nut and stainless steel washer. This fitting is for a composite firewall and the body has a reach of 0.500. Assembly weighs only 1.8oz-2.6oz (.11lb-.16lb) depending on ball hole size.
Meets FAR 23.1191 and AC 20.135 requirements.
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