A sump-plug or drain-plug wrench or key usually has a range of probably 5-10 head sizes for undoing and tightening various sizes of sump, rear axle, or gearbox drain plugs. Some wrenches have spanner-type heads for fitting over projecting plugs; others have key-type heads for fitting into recessed drain-plugs. Combination wrenches have a mixture of both types.

Guides that use

Checking the gearbox oil level, draining and refilling

A gearbox contains a great many moving parts. Some of them are submerged in oil and some of them...

Changing an oil filter

Fitting a cartridge-type filter Fitting a new disposable cartridge is a simple task, but you mus...