Riser cap and irrigation piping system using same

A combined riser cap and sprinkler riser for connection in a piping system to a tubular coupler having at least one open end configured to be connected to a fluid transport pipe, the tubular coupler having a tubular riser adapter in fluid communication with a central region thereof, the tubular riser adapter having an externally threaded surface, the combined riser cap and sprinkler riser comprising:

• a riser cap having a central tubular section defining a generally cylindrical bore, and an annular skirt coaxial with the central tubular section and having an inner diameter larger than an inner diameter of the central tubular section, the annular skirt having an inner surface having internal threads threadably connectable with the externally threaded surface of the tubular riser adapter;
• and
• a sprinkler riser having a first end configured to be disposed within the cylindrical bore of the riser cap, and the sprinkler riser is configured to be bonded to the riser cap.

A riser cap for connecting a sprinkler riser in a piping system to a tubular coupler having at least one open end configured to be connected to a fluid transport pipe, the tubular coupler having a tubular riser adapter in fluid communication with a central region thereof, the tubular riser adapter having an externally threaded surface, the riser cap comprising:

• a central tubular section defining a generally cylindrical bore for receiving a sprinkler riser, the central tubular section having open top and bottom ends, and an annular skirt coaxial with the central tubular section and having an inner diameter larger than an inner diameter of the central tubular section, the annular skirt having an inner surface having internal threads threadably connectable with the externally threaded surface of the tubular riser adapter, the bottom end of the central tubular section having an annular projection disposed opposite and spaced from a portion of the annular skirt, wherein the riser cap includes an annular recess adapted to receive a seal located in a wall extending laterally between the annular skirt and the annular projection.