This is a stainless steel short plug with an "O" ring on it. Possibly for an  5500/6500 pressure washer. Marked 0664192

Maximise the saving on postage and buy some of the related pressure washer parts below, or a hose, some dustbags and filters for your Nilfisk or ALTO vacuum cleaner!

At the moment standard postage is capped at a maximum of $25 within Australia