Plumbing Tutor

 

It can be quite confusing what "pipes" you need to install your new jet assembly.

 

HTC JET

 

HTA JET

 

BMH JET

As seen in the pictures, there are 2 basic ports. First, the smallest is 1/2" and is the incoming air. On the HTC there are 2 ports for this. One is used and the other plugged. On the HTA and BMH there are only one.

The HTC and HTA have a 1 1/2" incoming water port. The BMH has a 3/4" incoming water port.

The following the the typical plumbing parts you will use.

1/2" Air Line 1/2" Plug Part: P1-112--Used to "Plug" one of the 1/2" holes.
1/2" Adaptor Part P1-020--Used to mate 1/2" hose and housing (optional)
1/2" street 90 Elbow Part P1-111--Gives you a 90 degree turn
Late production they used a 1/2" street elbow with a barb fitting. You have a clamp you loosed to remove the small airline hose from the barb fitting. The new fitting glues into the HTC and reclamp the barb elbow.
1/2" Barb 90 Part B1-010--Used to attach small airline soft hose to jet.
     
3/4" or 1 1/2" Water Inlet 3/4" 90 Elbow Part P2-110
3/4" T Part P2-115
3/4" Barb Part B2-110
3/4" Barb T Part B2-120
1 1/2" 90 elbow Part P5-110
1 1/2" "T" Part  P5-113
     

Link To Piping Page

 

General Methodology to replace jets.
Step 1 Drain  6" below hot tub's jets.
Step 2 Remove side panel. Remove foam if present. Exposes back of jet and plumbing.
Step 3 ID the airline hose. It will be 1/2". Cut the piping at the point the fitting enters the actual jet housing. In most cases if you do not, you will not be able to slide the nut over it. Do this both for the airline fitting and if this jet assembly has a plug, the plug.
Step 4 Cut the pipe from the water inlet at the point the hose enters the Elbow or T.
Step 5 Cut the Elbow or T off the jet housing. If you have an elbow, this may be optional. If you have a T, the nut will not come off because of the T
Step 6 Remove the nut. Most LARGE channel locks or wrenches will be able to remove the nut IF there is enough work room. It very tight places, you usually can tap a screwdriver at an angle to start the nut turning lefty loosy.
Step 7 Remove the leveling ring if one is present
  Nut and level ring usually can be reused.
Step 8 Push the jet assembly toward the water side. Likely they used silicon to seal the housing to the hot tub shell and its a matter of braking the seal. You can also rock the jet to help break the seal. I have also used the same wrench to grab on the jet housing and rock to break the seal. Once broken, the assembly will fall into the hot tub.
Step 9 Clean the waterside of the shell well removing any leftover silicone.
Step 10 Run a bead of silicone on the flange of the new housing.
  I use GE's Silicone II in clear for kitchens.
Step 11 Slide the housing through the hole, put the level ring on, and then nut. Make sure housing is upright. Tighten nut to snug ONLY.
Step 12 When you tighten the housing it will spread the silicon and make a seal. You have likely put too much silicon and its now spread out. IMMEDIATELY clean with paper towels. Fresh silicon is fairly easy to clean and buff off. 10 minutes later its curing and turning into a gel and NOW its a mess to clean. So do immediately.
  I also place a paper towel where the nozzle is to catch any glue that might flow out to avoid glue on the water side of the jet or worst, on the hot tub's shell.
Step 13 Reverse order plumbing pipes to new jet assembly
  Note: Silicon, if you installed dry to dry surface, is water tight almost instantly but wise to let cure. PVC gluing should be allowed to cure 24hrs. So in theory you can fill the hot tub but do NOT turn the pumps on for 24hrs.

 

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