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Note that the purpose of this section is to show you how to remove & install a defective or broken jet assembly on a hot tub.    While every effort is made to be sure that virtually all areas of complexity are covered, you may find it more difficult or sometimes easier to accomplish this task.  Use common sense.  If the jet that you have on your pool or spa is a lot different from what is depicted here, then do not use these instructions. This is page 2 of this procedure.
Safety Warnings!
Remove Power from the spa/hot tub BEFORE performing this procedure.  Failure to comply with this requirement, can lead to electrical shock and/or electrocution!
Disclaimer

The instructions here are intended for general reference only.  Many hot tubs and spas are different from the one depicted here, and may require more or less mechanical effort or knowledge in order to achieve the desired results.
READ FIRST BEFORE YOU CONTINUE
Jet body removed Removing the old silicone sealant
With the jet body finally removed, it's a good idea to clean off and remove as much of the old sealant as you can.  But sometimes, that can be a virtual impossibility.  If I can't get it all off, then I just make sure that the old silicone sealant is well covered with new silicone. 

removing retaining collar..
I also make sure that any sealant on the face of the sealing surface in the spa itself is also removed.
 
Putting silicone sealant is not mandantory if you've got a good sealing surface on the inside of the spa shell, and you've got a ribbed gasket.  But I usually do it anyway, on both sides of the gasket.

New jet retaining ring installed. silicone sealant applied
With the new retaining ring installed through the spa shell, I apply a liberal amount of silicone around the base of the ring, with silicone applied directly to the spa shell itself.  It's ok if some gets on the threads.

attaching the jet body ALWAYS prime the joints first!
This shows how a jet can be threaded on without having an extra person... I use a flat head screwdriver shoved into the base of the retaining collar, (to hold it steady), and then rotate the body counter-clockwise and tighten it down.  As it gets really close to the shell, I'll have to remove the screwdriver, and pull out on the jet body, and at the same time rotating it into place.  You may have to go topside and take a look at the gasket to be sure it's not getting squeezed out.  If it is, then back the jet body off until the gasket is settled in normally.
 
Very important... Always use pvc primer to prepare the plumbing joint for new pipe.  It's the only way to be sure that you'll have a good, permanent bond in the joint.

priming everything that needs to be bonded.... installing extensions onto the existing plumbing
While we're at it, we'll go ahead and prime all parts that need to be cemented at one time, making installation a lot faster.
 
Since I didn't have a lot of extra flex hose installed, I've installed schedule 40 pvc couplers on the existing hose, with short extensions to insert into the new jet body.

applying the pvc cement connection made...
With all of the extensions in place, I always apply pvc cement to both the male and female ends to be joined.  Some plumbers may disagree with this, but when you consider the intense dynamic forces that these joints have to endure, between the heat and cold, plus the constant vibration encountered with the high speed water flow, then having a lot of cement, to guarantee a no-leak junction, will definitely make you sleep better at night.
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Rick Perry
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