"THREE (3) HOLES IN COVER TO ACCOMODATE A HUMIDITY INDICATOR (P/N TA356-545), PRESSURE EQUALIZATION VALVE (P/N TA330-20-20R) AND A RECORDS RECEPTACLE (P/N TA 475);COVER USED IN CONJUNCTION WITH A 253547-96 GASKET, 253547-98 LOCKING RING, 253547-95 BOLT AND MS35649-2382 NUT (ALL NOT SUPPLIED)"