Core plug
Videos
Core plugs, welch plugs, or freeze plugs are used to fill the sand casting core holes found on water-cooled internal combustion engines.
A core plug that has corroded from improper engine coolant maintenance, causing it to leak
Block heater
Videos
A block heater is used in cold climates to warm an engine prior to starting. They are mostly used for car engines; however, they have also been used in aircraft engines.
Core plug
…sensors may be installed into the location of a core plug on some engine designs. Another use is to install an aftermarket system designed to act as a block heater which is installed to keep an engine warm due to sub-freezing temperatures as found in far northern climates such as in Scandinavia, Canada, northern…
Electrical cord for powering a block heater
A block heater for a Honda K24-series engine.
A parked car plugged in to an electrical outlet to power the block heater