Patent ID: 8857729

Claim:
A method of sealing an irrigation sprinkler canister that is connected to a conduit of a water distribution network, the method comprising: removing, from an upper surface of the canister, a cap that is attached to the canister and configured to contain within the interior of the canister a pop-up riser, an associated biasing spring, and a throat piece defining a bore for receiving the pop-up riser; removing the pop-up riser from the interior of the irrigation sprinkler canister, thereby exposing an opening in the cap; inserting a threaded rod of a flanged screw through the opening, and thence through the bore of the throat piece; inserting the threaded rod into a threaded bore of a plug piece having a frusto-conical surface; rotating the flanged screw into the threaded bore, thereby drawing the plug piece towards the flanged screw, toward the throat piece, and towards the cap; further rotating the flanged screw until the frusto-conical surface of the plug piece enters and seals the bore of the throat piece, and the cap and the throat piece are captured between the plug piece and a flange of the flanged screw; inserting the plug piece into the canister; and re-attaching the cap to the upper surface of the canister to form a seal between the cap and the canister; whereby, the canister is sealed off against water flow from the water distribution network.