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A solenoid operated valve has a valve body with a plurality of ports and a spool slidable within the body to interconnect the ports in different combinations. A solenoid, which is coupled to drive the spool, has a coil wound on an annular bobbin with a tube of an electrically conductive, non-magneti

A solenoid operated valve has a valve body with a plurality of ports and a spool slidable within the body to interconnect the ports in different combinations. A solenoid, which is coupled to drive the spool, has a coil wound on an annular bobbin with a tube of an electrically conductive, non-magnetic metal within the bobbin. A first pole piece extends into one end of the tube and a second pole piece extends into another end of the tube. A separate bushing is located in an aperture in each pole piece. Each bushing has a tubular body with a first end section that has a larger outer diameter than a second end section and the second end section that has a smaller inner diameter than the first end section. The solenoid further includes an armature that is slidably received in the bushings and engaging the spool.

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A solenoid operated valve has a valve body with a plurality of ports and a spool slidable within the body to interconnect the ports in different combinations. A solenoid, which is coupled to drive the spool, has a coil wound on an annular bobbin with a tube of an electrically conductive, non-magneti

A solenoid operated valve has a valve body with a plurality of ports and a spool slidable within the body to interconnect the ports in different combinations. A solenoid, which is coupled to drive the spool, has a coil wound on an annular bobbin with a tube of an electrically conductive, non-magnetic metal within the bobbin. A first pole piece extends into one end of the tube and a second pole piece extends into another end of the tube. A separate bushing is located in an aperture in each pole piece. Each bushing has a tubular body with a first end section that has a larger outer diameter than a second end section and the second end section that has a smaller inner diameter than the first end section. The solenoid further includes an armature that is slidably received in the bushings and engaging the spool. t of claim 1, further comprising a base, the base being arranged for mountably receiving the frame assembly on an upper surface of the base, the base having a lower surface that is arranged for being mounted on the surface of a marine vessel. 12. A bitt with a freely rotatable line-handling surface, comprising: a substantially planar base having an upper surface and a lower surface, the lower surface being arranged for being mounted on a surface of a marine vessel; a frame having first and second substantially planar sides, the first and second sides having first and second ends, the first and second sides adjoining each other at their first ends and forming a non-zero angle therebetween, the first and second sides being attached to the upper surface of the base at the second ends; first and second shafts each having first and second ends and an axis, the first and second shafts being attached to the first and second sides at the first ends of the shafts, the axes of the first and second shafts extending outwardly from the first and second sides substantially perpendicular to the planes of the first and second sides, the second ends of the first and second shafts being attached to first and second retainers, respectively, and being unattached to any other structure; and first and second rollers each having an axis, each of the first and second rollers defining a bore along its axis, the bores of the first and second rollers being arranged for receiving the first and second shafts therethrough, respectively, the first and second rollers being rotatably mounted about the first and second shafts such that the first and second rollers provide freely rotatable line-handling surfaces. 13. The bitt of claim 12, wherein the first and second rollers have first and second end sections with a first outer diameter and a middle section with a second outer diameter, the first outer diameter being greater then the second outer diameter such that the first and second ends of the first and second rollers define shoulders. 14. The bitt of claim 12, wherein the first and second rollers have substantially constant outer diameters. 15. The bitt of claim 14, wherein the first and second rollers have first and second ends, the first and second rollers including flanges at their first and second ends, the flanges extending substantially perpendicular to the axes of the rollers. 16. The bitt of claim 12, wherein the second ends of the first and second shafts are threaded, and the first and second retainers are threadedly received about the second ends of the first and second shafts. 17. The bitt of claim 13, wherein the rollers are made of a compressible material. 18. The bitt of claim 17 wherein the compressible material is polyurethane. 19. The bitt of claim 12, wherein the angle formed between the first and second sides is approximately 90 degrees. 20. The bitt of claim 12, wherein the frame is made of unitary construction. 21. The bitt of claim 12, wherein the first side of the frame and the second side of the frame are separate members. 22. A bitt with a freely rotatable line-handling surface, comprising: a frame having a first side and a second side, the first side and the second side having first and second ends and being substantially planar, the first and second sides adjoining each other at their first ends and forming a non-zero angle therebetween, the first and second sides being arranged for being attachable to a surface of a marine vessel at the second end; first and second shafts each extending outwardly at a first end from the planes of the first and second sides of the frame, respectively, each of the first and second shafts having a longitudinal axis that extends approximately perpendicularly to the planes of the first and second sides of the frame, the first and second shafts having second ends attached to first and second retainers, respectively, and unattached to any other structure; and first and second rollers, each of the first and second rollers having an axis, each of the first and second rollers defining a bore along its axis, the bores of the first and second rollers being arranged for receiving the first and second shafts therethrough, respectively, the first and second rollers having first and second end sections with a first outer diameter and a middle section with a second outer diameter, the first outer diameter being greater then the second outer diameter such that the first and second ends of the first and second rollers define shoulder, the first and second rollers being rotatably mounted about the first and second shafts such that the first and second rollers provide freely rotatable line-handling surfaces. 23. The bitt of claim 22 wherein the second ends of the first and second shafts are threaded, and the first and second retainers are threadedly received about the second ends of the first and second shafts. 24. The bitt of claim 22, wherein the rollers are made of a compressible material. 25. The bitt of claim 24, wherein the compressible material is polyurethane. 26. The bitt of claim 22, wherein the angle formed between the first and second sides is approximately 90 degrees. 27. The bitt of claim 22, wherein the frame is made of unitary construction. 28. The bitt of claim 22, wherein the first side of the frame and the second side of the frame are separate members. 29. The bitt of claim 22, wherein the frame includes first and second mounting flanges attached to the second ends of the first and second frame members, the mounting flanges being arranged for mounting the frame assembly to the surface of a marine vessel. 30. The bitt of claim 22, further comprising a base, the base being arranged for mountably receiving the frame assembly on an upper surface of the base, the base having a lower surface that is arranged for being mounted on the surface of a marine vessel. 31. A bitt with a freely rotatable line-handling surface, comprising: a substantially planar base having an upper surface and a lower surface, the lower surface being arranged for being mounted on a surface of a marine vessel; a frame having first and second substantially planar sides, the first and second sides having first and second ends, the first and second sides adjoining each other at their first ends and defining a non-zero angle therebetween, the first and second sides being attached to the upper surface of the base at the second ends; first and second shafts each having first and second ends and an axis, the first and second shafts being attached to the first and second sides at the first ends of the shafts, the axes of the first and second shafts extending outwardly from the first and second sides substantially perpendicular to the planes of the first and second sides, the second ends of the first and second shafts being attached to first and second retainers, respectively, and being unattached to any other structure; and first and second rollers each having an axis, each of the first and second rollers defining a bore along its axis, the bores of the first and second rollers being arranged for receiving the first and second shafts therethrough, respectively, the first and second rollers having first and second end sections with a first outer diameter and a middle section with a second outer diameter, the first outer diameter being greater than the second outer diameter such that the first and second ends of the first and second rollers define shoulders, the first and second rollers being rotatably mounted about the first and second shafts such that the first and second rollers provide freely rotatable line-handling surfaces. 32. The bitt of claim 31, wherein the second ends of the first and second shafts are threaded, and the first and second retainers are threadedly received about the second ends of the first and second shafts. 33. The bitt of claim 31, wherein the rollers are made of a compressible material. 34. The bitt of claim 33