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A filter cartridge for operatively engaging a manifold having an ejection cam and an insertion cam. The filter cartridge includes a filter element and inlet/outlet portion in fluid communication with the filter element. The inlet/outlet portion extending from one end of the filter. A first lug protr

A filter cartridge for operatively engaging a manifold having an ejection cam and an insertion cam. The filter cartridge includes a filter element and inlet/outlet portion in fluid communication with the filter element. The inlet/outlet portion extending from one end of the filter. A first lug protruding radially outward from the inlet/outlet portion having a curved surface facing shoulder surface of the filter.

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1. A filter cartridge comprising: a sump;a stepped inlet/outlet having a first portion extending from one end of the sump having an outside diameter that is smaller than an outside diameter of the sump, and having a second portion extending from the first portion having an outside diameter that is s

1. A filter cartridge comprising: a sump;a stepped inlet/outlet having a first portion extending from one end of the sump having an outside diameter that is smaller than an outside diameter of the sump, and having a second portion extending from the first portion having an outside diameter that is smaller than the outside diameter of the first portion, the stepped inlet/outlet comprising an inlet port in the first portion circumferentially surrounding the second portion having an outlet port aligned with a central axis of the filter cartridge;a first lug on the first portion protruding outwardly from a surface of the first portion in a radial direction perpendicular to the central axis;a shoulder surface that is formed by the intersection of the sump and the stepped inlet/outlet;a filter disposed within the sump; andthe first lug comprising a curved surface facing the shoulder surface and curving away from the shoulder surface such that a distance between the curved surface and the shoulder surface varies and wherein a minimum distance between the curved surface and the shoulder surface is located in a plane intersecting with the central axis and bisecting the first lug into two halves. 2. The filter cartridge of claim 1 wherein the curved surface comprises a half-moon shape. 3. The filter cartridge of claim 1 further comprising a mechanical keying system on the inlet/outlet portion. 4. The filter cartridge of claim 3 wherein the mechanical keying system comprises protrusions and depressions on the stepped inlet/outlet. 5. The filter cartridge of claim 1 wherein the stepped inlet/outlet further comprises one or more protrusions that protrude outwardly in a radial direction perpendicular to the central axis. 6. The filter cartridge of claim 5 wherein the one or more protrusions are complementary to one or more depressions on a manifold. 7. The filter cartridge of claim 1 wherein a slope of the curved surface transitions from a positive slope to a negative slope at the minimum distance and the curved surface is symmetrical about the minimum distance. 8. A filter cartridge comprising: a sump;a stepped inlet/outlet having a first portion extending from one end of the sump having an outside diameter that is smaller than an outside diameter of the sump, and having a second portion extending from the first portion having an outside diameter that is smaller than the outside diameter of the first portion, the stepped inlet/outlet comprising an inlet port in the first portion and an outlet port in the second portion both aligned parallel with a central axis of the filter cartridge;a first lug on the first portion protruding outwardly from a surface of the first portion in a radial direction perpendicular to the central axis;a shoulder surface that is formed by the intersection of the sump and the stepped inlet/outlet;a filter disposed within the sump; andthe first lug comprising a curved surface facing the shoulder surface and curving away from the shoulder surface such that a distance between the curved surface and the shoulder surface varies and wherein a minimum distance between the curved surface and the shoulder surface is located in a plane intersecting with the central axis and bisecting the first lug into two halves, and the curved surface comprises a half-moon shape. 9. The filter cartridge of claim 8 further comprising a mechanical keying system on the stepped inlet/outlet. 10. The filter cartridge of claim 9 wherein the mechanical keying system comprises protrusions and depressions on the stepped inlet/outlet. 11. The filter cartridge of claim 8 wherein the stepped inlet/outlet further comprises one or more protrusions that protrude outwardly in a radial direction perpendicular to the central axis. 12. The filter cartridge of claim 11 wherein the one or more protrusions are complementary to one or more depressions on a manifold. 13. The filter cartridge of claim 8 wherein a slope of the curved surface transitions from a positive slope to a negative slope at the minimum distance and the curved surface is symmetrical about the minimum distance. 14. A filter cartridge comprising: a sump;a stepped inlet/outlet having a first portion extending from one end of the sump having an outside diameter that is smaller than an outside diameter of the sump, and having a second portion extending from the first portion having an outside diameter that is smaller than the outside diameter of the first portion, the stepped inlet/outlet comprising an inlet port and an outlet port;a first lug on the first portion protruding outwardly from a surface of the first portion in a radial direction from a central axis of the filter cartridge;a second lug on the first portion protruding outwardly from the surface of the first portion in a radial direction from the central axis of the filter cartridge;a shoulder surface that is formed by the intersection of the sump and the stepped inlet/outlet;a filter disposed within the sump; anda first curved surface on the first lug facing the shoulder surface and curving away from the shoulder surface such that a distance between the first curved surface and the shoulder surface varies and wherein a minimum distance between the first curved surface and the shoulder surface is located in a plane intersecting with the central axis and bisecting the first lug into two halves; anda second curved surface on the second lug facing the shoulder surface and curving away from the shoulder surface such that a distance between the second curved surface and the shoulder surface varies and wherein a minimum distance between the second curved surface and the shoulder surface is located in the plane intersecting with the central axis and bisecting the first lug into two halves. 15. The filter cartridge of claim 14 further comprising a mechanical keying system on the stepped inlet/outlet. 16. The filter cartridge of claim 15 wherein the mechanical keying system comprises protrusions and depressions on the stepped inlet/outlet. 17. The filter cartridge of claim 14 wherein the stepped inlet/outlet further comprises one or more protrusions that protrude outwardly in a radial direction perpendicular to the central axis. 18. The filter cartridge of claim 17 wherein the one or more protrusions are complementary to one or more depressions on a spool valve manifold. 19. The filter cartridge of claim 14 wherein a slope of the first curved surface transitions from a positive slope to a negative slope at the minimum distance and the first curved surface is symmetrical about the minimum distance, and wherein a slope of the second curved surface transitions from a positive slope to a negative slope at the minimum distance and the second curved surface is symmetrical about the minimum distance. 20. A method comprising: installing a filter cartridge into a spool valve manifold by rotating a valve body of the spool valve manifold about a central axis of the spool valve manifold, engaging a first and a second curved surface of the filter cartridge with an insertion cam, and moving the filter cartridge perpendicularly relative to the central axis of the spool valve manifold; and wherein the filter cartridge comprises; a sump;an inlet/outlet portion extending from one end of the sump having an outside diameter that is smaller than an outside diameter of the sump, and comprising an inlet port and an outlet port;a first lug on the inlet/outlet portion protruding outwardly from a surface of the inlet/outlet portion in a radial direction from a central axis of the filter cartridge;a second lug on the inlet/outlet portion protruding outwardly from the surface of the inlet/outlet portion in a radial direction from the central axis of the filter cartridge;a shoulder surface that is formed by the intersection of the sump and the inlet/outlet portion;a filter disposed within the sump; andthe first curved surface on the first lug facing the shoulder surface, the first curved surface being axially spaced from the shoulder surface to form a space between the first curved surface and the shoulder surface; andthe second curved surface on the second lug facing the shoulder surface, the second curved surface being axially spaced from the shoulder surface to form a space between the second curved surface and the shoulder surface; andwherein the first and second curved surfaces engage with the insertion cam of the spool valve manifold and the filter cartridge is installed into the spool valve manifold without a rotation of the filter cartridge about the central axis of the filter cartridge. 21. The method of claim 20 further comprising releasing the filter cartridge from the spool valve manifold by rotating the valve body of the spool valve manifold about the central axis of the spool valve manifold, engaging the shoulder surface with an ejection cam of the spool valve manifold, and moving the filter cartridge perpendicularly relative to the central axis of the spool valve manifold. 22. The method of claim 20 wherein the first and second curved surfaces comprise a half-moon shape. 23. The method of claim 21 wherein the first and second curved surfaces comprise a half-moon shape.