TWO-PACK  Manifold and Block Drain Plug Kits.

Includes TWO brass plug and petcock assembly as seen in the picture
Used to drain your engine block and manifold
Used on all of the older manifolds and blocks
MerCruiser engines from the 70s and 80 and early 90s

Threads are 1/4 pipe

Replaces part number 8247, 22-16951Q1