Replacement of the lower fuselage fuel drain cap (P/N AN929-6) with an adapter type coupling, (belly drain P/N MT-101) and an exposed quick drain valve P/N CAV-160D). (A152 SERIES AIRPLANES STARTING WITH MODEL150F (S/N 15061533) AND SUBSEQUENT) View PDF on drs.faa.gov ↗

The STC PDF is authoritative: installation instructions, ICA requirements and limitations.