Sump Gooseneck, M14-P
There are two goosenecks in the Yak 52 engine compartment. This larger one attaches to hose PN 4-14-900 linking the M14-P sump and the Oil Cyclone.
A gasket for this 2 bolt flange, PN 1421134, is included.
(The shorter gooseneck shown in the comparison photo is connected to the Oil Pump scavenge side.)