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A sprinkler has a hollow outer case and a riser vertically reciprocable within the outer case through an upper end thereof. A nozzle is mounted at an upper end of the riser. A body cap fits over the upper end of the outer case and retains the riser. The body cap has a plurality of circumferentially

A sprinkler has a hollow outer case and a riser vertically reciprocable within the outer case through an upper end thereof. A nozzle is mounted at an upper end of the riser. A body cap fits over the upper end of the outer case and retains the riser. The body cap has a plurality of circumferentially spaced vertical ribs that connect a reduced diameter upper portion of the body cap with an enlarged lower portion of the body cap. An elastomeric cover extends over at least the reduced diameter upper portion of the body cap and at least a portion of the ribs.

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1. A sprinkler, comprising: a hollow outer case;a riser vertically reciprocable within the outer case through an upper end thereof;a nozzle in a turret rotatably mounted at an upper end of the riser to determine an area watered by the nozzle;an impeller and a reduction gear train mounted in the rise

1. A sprinkler, comprising: a hollow outer case;a riser vertically reciprocable within the outer case through an upper end thereof;a nozzle in a turret rotatably mounted at an upper end of the riser to determine an area watered by the nozzle;an impeller and a reduction gear train mounted in the riser and coupled to the nozzle turret for rotating the nozzle;a body cap that fits over the upper end of the outer case and retains the riser and has a plurality of circumferentially spaced vertical ribs that connect a reduced diameter generally cylindrical upper portion of the body cap with an enlarged diameter generally cylindrical lower portion of the body cap, the body cap being injection molded out of a hard thermoplastic material, and having a first set of threads formed on the enlarged lower portion of the body cap that screw over a second set of threads formed on a surface of the upper end of the outer case; andan elastomeric cover formed over at least the reduced diameter upper portion of the body cap and at least a portion of the ribs to provide a mechanical interlock between the cover and the body cap;wherein the elastomeric cover has a plurality of external ribs formed that each envelope a corresponding rib of the body cap. 2. The sprinkler of claim 1 wherein the elastomeric cover is made of a soft thermoplastic elastomer. 3. The sprinkler of claim 1 wherein each rib has an upper generally triangular section and a lower generally rectangular section. 4. The sprinkler of claim 1 wherein an elastomeric disk covers an upper circular surface of the turret. 5. The sprinkler of claim 1 and further comprising a reversing mechanism mounted in the riser and coupled to the nozzle turret for rotating the nozzle back and forth through a pre-selected arc. 6. The sprinkler of claim 1 and further comprising a spring surrounding the riser within the outer case that biases the riser to a retracted position and an elastomeric wiper seal between the riser and the outer case. 7. The sprinkler of claim 1 wherein the ribs include extensions that span an entire vertical height of the enlarged lower portion of the body cap. 8. The sprinkler of claim 1 wherein the body cap is formed with a land in the form of radially extending projection that is located at a lower boundary of the elastomeric cover. 9. The sprinkler of claim 1 wherein the elastomeric cover is co-molded over the reduced diameter upper portion of the body cap. 10. The sprinkler of claim 1 wherein the elastomeric cover is bonded to the reduced diameter upper portion of the body cap. 11. A sprinkler comprising: a hollow outer case having an upper end;a riser vertically reciprocable within the outer case through the upper end thereof;a nozzle mounted adjacent an upper end of the riser;a rigid body cap positioned adjacent the upper end of the outer case and comprising: a lower cap portion having an outer diameter;an upper cap portion having an outer diameter that is less than the outer diameter of the lower cap portion; anda plurality of ribs extending from the lower cap portion to the upper cap portion, each rib having a lower rib portion and an upper rib portion wherein the upper rib portion has a thickness that is less than a thickness of the lower rib portion; andan elastomeric cover formed over the upper cap portion and enveloping the upper rib portion of each rib. 12. The sprinkler of claim 11 further comprising female threads formed on an interior of the lower cap portion. 13. The sprinkler of claim 11 wherein each rib has an upper generally triangular section and a lower generally rectangular section. 14. The sprinkler of claim 11, wherein the elastomeric cover has a plurality of external ribs. 15. The sprinkler of claim 11, wherein the elastomeric cover is co-molded over the upper cap portion. 16. A sprinkler, comprising: a hollow outer case;a riser vertically reciprocable within the outer case through an upper end thereof;a nozzle in a turret rotatably mounted at an upper end of the riser to determine an area watered by the nozzle;an impeller and a reduction gear train mounted in the riser and coupled to the nozzle turret for rotating the nozzle;a body cap that fits over the upper end of the outer case and retains the riser and has a plurality of circumferentially spaced vertical ribs that connect a reduced diameter generally cylindrical upper portion of the body cap with an enlarged diameter generally cylindrical lower portion of the body cap, the body cap being injection molded out of a hard thermoplastic material, and having a first set of threads formed on the enlarged lower portion of the body cap that screw over a second set of threads formed on a surface of the upper end of the outer case; andan elastomeric cover formed over at least the reduced diameter upper portion of the body cap and at least a portion of the ribs to provide a mechanical interlock between the cover and the body cap;wherein the body cap is formed with a land in the form of radially extending projection that is located at a lower boundary of the elastomeric cover. 17. The sprinkler of claim 16 wherein the elastomeric cover is made of a soft thermoplastic elastomer. 18. The sprinkler of claim 16 wherein each rib has an upper generally triangular section and a lower generally rectangular section. 19. The sprinkler of claim 16 wherein an elastomeric disk covers an upper circular surface of the turret. 20. The sprinkler of claim 16 and further comprising a reversing mechanism mounted in the riser and coupled to the nozzle turret for rotating the nozzle back and forth through a pre-selected arc. 21. The sprinkler of claim 16 wherein the ribs include extensions that span an entire vertical height of the enlarged lower portion of the body cap. 22. The sprinkler of claim 16 wherein the elastomeric cover has a plurality of external ribs formed that each envelope a corresponding rib of the body cap.