A rubber washer is urged towards the within floor of the bellows on the flare by a Delrin packing nut 36. The sealing surfaces of the air cap 29 are radially symmetrical, and, subsequently, the air cap 29 is rotatable about the axis of the fluid discharge nozzle 24. That is, the air cap can be rotated so that the flat fan spray of the nozzle can be oriented within the airplane of the paper, perpendicular to the airplane of the paper of any angle in between. Another specific side of this invention is the seal between one finish of the bellows and the opening into the conduit. This seal includes a Teflon jacketed elastomeric washer around one tubular extension of the bellows and urged against the periphery of the opening into the conduit.

The Teflon jacket 138 is mostly within the form of two thin walled deformable annular membranes that are spaced aside along a typical axis however which are continuous via their smaller or inner annular diameter. The area between the membranes is full of a washer 139 produced from rubber or some other elastomeric material. One face of the jacket 138 is urged towards the face of an annular step 137 surrounding the opening into the conduit 122. The jacket is urged against the face of the annular step 137 by means of a Delrin second washer means 142. The flare of the uppermost extension of the bellows 119 is in urged engagement with the uppermost surface of the second washer 142.

At the upper end of the bellows 119 is a second cylindrical extension of the convolutes with a flared uppermost end. A Teflon jacketed elastomeric washer surrounds the tubular extension of the bellows.

One face of the jacket is urged against an annular face 37 of the barrel 2, which face 37 surrounds the opening into the fluid conduit 22. The jacket is urged in opposition to the annular face 37 across the fluid conduit 22 via a Delrin second washer means forty two. The flare of the rearward extension of the bellows 19 is in urged engagement with the rearward surface of the second washer means forty two.

A rubber, elastomeric washer 143 is urged against the within floor of the bellows on the flare by a packing nut 108 acting by way of a spacer 136. Packing nut 108 forces the spacer 136 against the elastomeric washer 143. At the rearward end of the bellows 19 is a second cylindrical extension of the convolutes with a flared rearward finish. The jacket 38 is made of teflon and is mostly within the type of two thin walled deformable annular membranes that are spaced apart along a common axis however that are continuous via their smaller or inside annular diameter. The house between the membranes is crammed with rubber or another elastomeric materials 39.