Rapco RA1J7-1 Central Air Filter Assembly. For vacuum systems. Metal manifold with two 3/8" hose fittings and replaceable RA-D9-18-1 filter elements. Overall length 3-14" x 2-7/8" diameter.
Recommended Replacement: 500 hours / 1 year.
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There should be a bracket installed in the aircraft, the filter would be installed via the screw that is included.