Shut off the water supply to the irrigation system. Open an outdoor plumbing fixture or turn on the sprinkler system to allow excess water to drain from the pipes.
Dig a trench around the water supply line that you will extend. Choose a line controlled by the main water supply valve, not a sprinkler valve. If you choose a line controlled by a sprinkler valve, the hose bibb will only be operational when the sprinkler valve is in the on position. Extend the trench to the garden, remaining as far below grade as the original supply line.
Cut the supply line with PVC cutters and allow remaining water to drain from the pipes. Make another cut on the supply line to accommodate the PVC T fitting; the T fitting will create a branch from the main supply line.
Clean and dry the loose ends of the supply line with a rag. Unscrew the caps of both the PVC primer and the PVC glue. Use the dauber attached to the primer's cap to apply a coating of primer to the interior of one of the T fitting's top openings; the top openings are the parallel openings. Apply a coating of primer around the exterior of one of the loose ends of the supply pipe.
Remove the dauber from the PVC glue canister. While the primer is still wet, apply a coating of glue directly on top of the primer coated pieces. Insert the coated side of the T onto the coated pipe, twist until the fitting faces the garden and is parallel with the trench's bottom. Firmly hold the fitting and pipe for approximately 30 seconds.
Apply a coating of primer and glue to the interior of the T fitting's other top opening and the end of the loose supply pipe. Stretch the supply pipe outward and slip the T fitting over the supply pipe. Hold the joint for 30 seconds. Allow the joint to cure for approximately 10 minutes before agitating.
Cut a piece of PVC pipe to fit the length of the trench. Apply primer and glue to the end of the supply pipe and the interior of the remaining open end of the T fitting. Insert the pipe into the T fitting, twist ¼ turn and hold for 30 seconds. Allow the joint to cure for 10 minutes.
Install a PVC elbow onto the newly installed pipe. Position the elbow so that its open end faces directly upward. Cut a short portion of PVC pipe to extend from the elbow at the trench's bottom to the desired height of the garden hose bibb. Glue the small pipe to the elbow.
Glue a slip-to-pipe-thread fitting onto the open end of the newly installed supply pipe. Wrap a double layer of pipe thread seal tape around the fitting's threads. Press the hose bibb's threads against the fitting's threads and twist counterclockwise to tighten the hose bibb onto the pipe.
Turn the hose bibb to the off position. Turn on the water supply, check for leaks and refill the trench.
Things You Will Need
- PVC cutters
- Clean rag
- PVC T fitting
- PVC primer
- PVC glue
- PVC pipe
- PVC elbow
- PVC slip-to-pipe-thread fitting
- Pipe thread seal tape
- Hose bibb
- Brace the hose bibb's above-ground supply pipe with stakes, if necessary.