A trenching tamper is essentially an earth rammer specialised for ramming trenches.
A trenching tamper has a narrow head which is ideal for ramming the base of a trench. It sometimes has a longer handle to make working at a deeper level easier.
What are the advantages of using a trenching tamper?
For trench tamping, the manual tamper is preferable to a mechanical one which could damage any pipes it comes into contact with.