NAPCO Certa-Set Field Installation Manual page 3

4. Press the sled coupling onto the spigot end of the pipe until the pipe has seated over the O-ring. The spline hole will align
with the groove in the pipe when properly installed.
Misaligned pipe and
sled coupling
5. Insert a spline at a low angle to the pipe until the insertion mark (raised dot) reaches the spline hole on the sled coupling.
Insert pointed end of
spline first
6. Sprinkler risers:
¾" Pre-assembled Certa-Set Riser or ½" Aluminum Assembled Riser
A. ¾" Pre-assembled Certa-Set Risers
1. Insert the flanged O-ring into the riser. The larger ridge faces the riser cap; the smaller ridge faces the sled
coupling. Do not use lubricant.
Missing O-ring
Properly aligned pipe and
sled coupling
Push spline into spline hole
Incorrect O-ring
positioning
Push sled coupling
onto pipe
Push spline into spline hole
Correct O-ring
positioning
Push sled coupling
onto pipe
Spline fully inserted
Correct O-ring
positioning
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