KnuckleHead Extensions increase elevations of pipes, struts, solar arrays or walkways. Our KnuckleHead Kits include an 8-, 12-, or 18-inch extension cylinder that fits into the Universal Base, a threaded rod and coupling and GREEN LINK Adhesive/Sealant. If you want to make your own size extension the following are the steps to make a custom sized extension. If you are extending over 18” in height you will need our custom large base.
Four easy steps to make a KnuckleHead extension
Add a 3/8”x16 1-1/8” Hex Rod Coupling Nut Zinc Plated use thread locker screw half way onto base threaded rod as shown
Next determine the size of the extension you are wanting to make. In this case we are making a 12” extension
Cut 3/8”-16 threaded rod 2 ½” shorter than desired extension length – for 12” you will cut threaded rod at 9 ½”. Install threaded rod with thread locker placed on bottom to the Hex rod coupling nut securely tighten
Cut 2 ½” Electrical Grade Schedule 40 PVC for the extension. You will cut this piece ½” shorter than the desired height of the extension. For the 12” Extension cut PVC to 11 1/2” and slip PVC extension onto Universal Base as shown
Place the desired KnuckleHead top on the extension by screwing top onto threaded rod until it is firmly in place.
You have now completed the 4 steps to make an extension.