Design 1: No intraoral, 45 degree flat wall. Design 2: Intraoral, 45 degree flat wall, small area. Design 3: No intraoral, 50 degree flat wall. Design 4: No intraoral, 30 degree flat wall. Design 5: No intraoral, 30 degree convex wall. Design 5: No intraoral, 50 degree convex wall. Design 6: No intraoral, 45 degree convex wall. 

Design 1: ¾ intraoral area from phase 4,  ½ vertical area wal from phase 4. Design 2: ¾ intraoral, 2x vertical area wall, 20 degree curve. Design 3.  ¾ intraoral 2x vertical area wall, 15 degree curve. Design 4. No intraoral, 2x vertical area wall, 15 degree curve. Design 5.  ¾ intraoral, ½  vertical area wall, 20 degree curve. Design 6.  ¾ intraoral, ½  vertical area wall, 20 degree curve. Design 7.  ¾ intraoral, ½  vertical area wall, 15 degree curve. Design 8  ¾ intraoral, ⅓  vertical area wall.

Design 1: small intraoral piece with interface surface on a 30 degree plane towards the face and 20 degree curved wall.  Design 2: small intraoral piece with interface surface on a 35 degree plane and 20 degree curved wall.  Design 3: small intraoral piece with interface surface on a 40 degree plane and 20 degree curved wall.  Design 4: small intraoral piece with interface surface on a 40 degree plane and 30 degree curved wall.

Design 1: asymmetric solid wall, design 2: asymmetric curved wall with increased thickness of 0.2in, design 3: asymmetric solid wall with increased curvature angle, design 4:  asymmetric solid wall with increased curvature angle and increased thickness of 0.2in

Design 1: asymmetric U-Cup sea but thinner towards mouthpiece, design 2: symmetric U-Cup seal but thinner towards mouthpiece, design 3: full frontal cover moved towards tip of mouthpiece. 

Design 1: Double wall seal, design 2: Full cover, design 3: Symmetric U-Cup seal, design 4: asymmetric U-Cup seal.