Conical seal fitting and assemblies therewith

A conical seal fitting comprising:

• a conical seal fitting (CSF) having a generally tubular shape, proximal and distal ends, a length between the proximal and distal ends and a longitudinal bore throughout the length, wherein the CSF is designed and configured to receive and seal a tube that extends through the bore of the CSF, wherein
• the CSF has an exterior conical sealing surface proximal to the distal end, wherein the conical sealing surface has a circumference that reduces in the direction of from the proximal end toward the distal end, wherein
• the CSF has a first portion adjacent to the conical sealing surface and toward the proximal end, wherein
• the CSF has a second portion adjacent to the first portion and toward the proximal end, wherein
• the first and second portions have outside diameters, wherein the outside diameter of the second portion is less than the outside diameter of the first portion, wherein the CSF has a first shoulder defined at a transition between the first and second portions, wherein
• the first portion has a first groove around its circumference that is spaced apart from the exterior conical sealing surface, wherein the first groove is between the first shoulder and the exterior conical sealing surface, and wherein the first groove is designed and configured to receive an O-ring for providing a seal that is secondary to a primary seal formed with the exterior conical sealing surface.