K-Rain Design & Installation Guide

Installing Irrigation System

Installing an irrigation system can be fairly simple. Follow the guide below. For more detailed installation instructions, refer to the K-Rain Design & Installation Guide PDF.


Before you begin trenching, make sure to always “Call Before You Dig” to know the locations of nearby gas lines, etc. You make want to consider renting a trencher. When digging trenches for an irrigation system, we recommend it be 6–8” deep, and 3–4” wide. This will depend on how many irrigation lines are going in and the size of the lines. Larger and deeper holes will need to be made around the areas where the sprinkler heads and valve boxes will be placed.


When gluing your PVC pipe together, be sure to use a primer before you use the cement. We recommend wiping the areas you will be gluing with a clean cloth before attempting to glue. When applying glue, an even coating should be applied around the necessary area, making sure that you do not over–glue the connection. Apply a smooth, even coat of glue on the male and female connections. After applying the glue, connect the two ends and turn the pipe 1/4 of a full turn. The 2 connections should be as far in as the fitting will allow for. * Be sure to read the full instructions as indicated on the glue can.

If using poly pipe, be sure to use clamps in conjunction with the barbed fittings to prevent any leaks.


When installing the mainline from the water source to the valve boxes, take extreme caution when installing. Schedule 40 pipe is thicker than other pipe, and is recommended for mainlines. Be sure to teflon threads, and use glue carefully when dealing with a mainline.

Before the mainline enters the ground is where you will have your ball valve for emergency shutoff, alternate hose connection and filter (if applicable). The mainline will continue on into the ground and to the valve box.

Valve Box

Dig a hole for where the valve box will be installed, making sure that all vales and pipes will have room to fit underneath the box itself. Make sure that all the manifold connections are done properly, as these are also considered apart of the mainline.

Controller & Wire

Before you begin backfilling the trenches, be sure that you have run the wire from the valve box to where you would like your controller to be installed. Be sure to leave a few extra feet of wire at the valve box and the controller. Each of the valves will have 2 wires. Each valve will have one independent wire that runs directly to the controller. The second wire(s) on the valve(s) will need to be grouped and connected to one strand of wire going to the controller. This is the common wire (usually white in color) that links all the valves through one wire to the controller. It does not matter which wire is which. We recommend the use of waterproof gel marrets to make these connections.

Adding Swing joints & Sprinklers

At each spot where you will have a sprinkler, we recommend installing a “swing joint” in between the pipe and the sprinkler. The swing joint allows the sprinkler to move slightly in case of it being stepped on. This prevents the pipes from cracking. Use the necessary fittings to connect the swing joint to the PVC pipe. The end of the swing joint that only has 1 fitting on it will connect to the PVC pipe. The other end of the swing joint where there are 2 fittings is the end that the sprinkler will sit on. Refer to diagrams if needed.

NOTE: It is highly recommended to flush the lines before adding the sprinklers, to avoid the sprinklers getting clogged with debris. This can be done by turning on each zone for a minute, being sure not to flood the trench, but making sure that all the debris is exited from the lines before adding the rotors. The flush caps on the spray–heads will allow for small debris to exit when the zone is turned on.


When backfilling trenches, hold the irrigation lines down, and backfill the necessary areas. Make sure the lines are a few inches under the ground after backfilling.