Since you don't need the electrical to work with it, all you need is a Basic Hose (
https://builtinvacuum.com/hoses/basichoses.html). It will fit your wall inlet and the attachment end, the metal pipe end, will go directly into the hole of the wall end of your electric hose. If you needed to also extend the 110 volts you would need a new 25' Electric Hose and a couple #480AC adaptors (this will only work if your original hose is direct connect, not corded).