Patent ID: 8161984

Claim:
An apparatus, comprising: a foam generator including a female housing having an inner surface; and a male plug, further comprising a first hollow cylinder with circumferential channels into which circumferential channels a fluid flows, a chamber connected to the first hollow cylinder, wherein a gas is mixed with the fluid to form a foam, a solid cylinder connected to the chamber, wherein the solid cylinder has a helical indentation on an outside surface of the solid cylinder which forms a sealed channel with an inner surface of the female housing when the solid cylinder is resident in the female housing, the foam being able to flow from the chamber of the male plug to the sealed channel where the foam moves for a distance and is further mixed, and a second hollow cylinder with circumferential channels, into which circumferential channels the foam flows; and a proximity head for receiving the foam from the foam generator and delivering the received foam to a surface of a substrate.