Abstract: A transparent coupling for joining the ends of relatively soft plastic conduit. Visual inspection through the coupling affords confidence that the conduits have been installed in their proper position within the coupling. Internal circumferential barbs of the coupling penetrate the conduit and secure the conduit within the coupling and also provide a seal between the conduit and the coupling.

Abstract: A coupling is provided for joining the ends of relatively soft plastic conduit. Hinged shell halves contain gripping teeth that penetrate and secure the conduit ends together. Penetration of the gripping teeth into the plastic conduit is accomplished by toggle clamps that supply the necessary embedding force. A seal is provided that prevents leakage into or out of the joint between the conduit ends.

Abstract: A pop-up sprinkler which includes a housing, a riser in the housing movable between an extended position in which the riser extends from the housing and a retracted position in which the riser is retracted from the extended position and a pressure regulator in the riser. The pressure regulator can be constructed as a cartridge or separate unit and installed in the riser. The riser has an aperture adjacent the pressure regulator and the aperture is between first and second axially spaced seals in the extended position so as to reduce the likelihood of clogging of the aperture. A dirt tolerant wiper seal is mounted on a movable valve tube of the pressure regulator and a pressure activated seal is provided between a valve seat of the pressure regulator and the valve tube.

Abstract: A rotary sprinkler having an intermittent motion mechanism which includes a driving gear and a driven gear with the driving and driven gears being drivingly engageable. The driven gear has a first set of gear teeth on one level and a second set of gear teeth on a second level. The gear teeth of the first set are axially and circumferentially offset from the gear teeth of the second set. The driving gear has a single driving gear tooth drivingly engageable with the gear teeth of the first set to drive the driven gear and a circumferential surface axially offset from the driving gear tooth and cooperable with the gear teeth of the second set to substantially retain the driven gear against rotation when the driving gear tooth is not in driving engagement with the gear teeth of the first set.