This G21 pump is specified for Pleasurecraft Marine 302 and 351 engines.
It is pulley driven with opposed ports for hose connections.

Heavy duty design for pulley drive or long couple
Mechanical seal for extended seal life
Rear support bushing for load absorption
Ball bearing supported drive shaft
Neoprene impeller and Buna seal standard
Stainless steel shaft
Inlet port: 1"
Outlet port: 1"
Impeller Kit: 09959K
Minor Repair Kit: 23979
Major Repair Kit: 12665