machine part, namely, an orifice with a non-circular internal chamber designed to be attached to the end of a hose or gun assembly which together direct a high pressure stream of gas, fluid and/or abrasive slurry flow from a high pressure pump; which orifice, because of the non-circular internal chamber, acts to direct and change the momentum of the gas, fluid and/or abrasive slurry flow to enhance high pressure fluid cutting and cleaning tasks