Installing a Check Valve

1) Unscrew the top (black) cap.	2) Lift the white seal top off the sprinkler. (This might be a little hard to do.)
3) Take the entire internal assembly out of the sprinkler casing.	4) Flip the internal assembly over to place the Check Valve on the bottom.
5) Press the Check Valve into the bottom of the assembly, rubber side facing out.	6) Replace the internal assembly and screw the cap back on.