WheelMasterWheel Masters 8001 AM4 Stainless Steel Hub Mount - 4 Hose Kit for 16"-19.5" Wheels

I would give this set an absolute perfect rating except that the 90 degree bend was not sufficient to use perfectly with wheel simulators on. It should be 135 degrees. I have a Thor 23u, class c motor home that is built on a Ford E350 chassis. It has the standard 16 inch wheels with the 4 oval shaped hand hols in the rims. I have metal stems as well.Here are a few recommendations:1) do not install extensions on rubber stems. You don't want to create a fatigue situation that will cause your stems to fail, using metal stems makes that all but impossible2) if you have stainless steel wheel simulators (hub caps), do yourself a favor get a good set of brad point pits. I didn't have any so I used some standard twist bits. It was exceedingly difficult to get the bits started and keep them from wandering even though I center punched the hole locations before drilling. I think those hubcaps are made from 316 stainless which is very hard. A brad point bit would have made this much easier.3) on 16" wheels, it is all but impossible to drill the rivet holes on the sides of the center hub cap without having one of those 90 degree drills or attachments. I didn't have one so I put the securing tabs on the more flat outward face (think flat end of the cylinder that covers the actual hub of the wheel). It seems to work fine without putting stress on the stem extensions4) use some blue loctite on the nuts that hold the extension inflation valve to the support. This will help keep the extensions locked on5) The RV hub caps that we have are the kind that are secured around the rim of the wheel (the pry off kind) I found it helpful to rotate the hub cap slightly to provide a little clearance for the 90 degree bend for the outer wheel. This also pushed the ends of the studs against the center part of the hub cap and will keep that from being able to move around which will help keep the extensions more steady and put less fatigue stresses on the system.6) DO NOT over tighten the stem extensions. I did on one and what happens is the polymer seal that sits against the stem face gets compressed so far that it will seal against the pin that opens the stem valve which will block the flow of air. You can correct for this by backing the nut off a couple turns. You only need to go a little past the point that air stops leaking7) if you can't reach your inner stem don't worry about it I found it super easy to get the extension on without using any tools. The tubing is stiff enough that you can easily get the end on the stem and there is no free spinning nut on the straight tube so you can just twist the entire tube from the outside and get it snugly on the stem. I was concerned about that when i bought this but it was super easy.8) The supports are held on with 2 rivets. Don't drill both holes at the same time. Drill one, put the rivet in and then use the other hole to accurately mark for the second hold. You can move the brace out of the way even after putting the first rivet in. Use a center punch to mark the hole and then use a brad point bit to drill it out.All in all, the install took me about an hour and went smoothly. It would have gone much easier if I had a brad point bit. The hardest part was drilling through the stainless steel of the hub cap. I had a really hard time getting a twist bit to start to cut into the metal. I had to push so hard that i broke one of my carbide bits. It will help if you can "choke up" on the bit or get a short machinists bit so that you don't have much sticking out. A brad point bit will start cutting with much less pressure and will not wander as much.

I agree with Dirk Van Essendelft. I have a F53 chassis. The dual outer wheel valve stem points inward, toward the motor home. The 90 degree extensions, in this kit, intended for that application need to be 135 degree. I had to add another valve extension to accommodate that problem. I intend to install a TPMS and need solid attach points for this. I have not traveled yet with these extensions. I will update once I do.

Solved my air pressure problems on my class c r.v. Took it to an r.v. Mechanic. Installed on the hubs of the wheel cover for easy access. Tried different styles cause they were cheaper and installed myself, Big mistake. Save headaches and have it done. Three trips out and no problems, well made.

Worked GREAT for my 2012 F350.add a drop of silicone to the mounts for perfect fit! Made it EASY PEASY to install my TPMS too!

Easy to install on my dual wheel motor home. Hardest thing was where to mount on my hubcaps.

This is my second set. I was very happy with the first set that lasted 5 years. I replaced the set because I replaced the tires. No failures! This set you can actually see lower quality. What I can see is the screw onto the stem is definitely cheaper now.Second...These DO NOT FIT 19.5 wheel master simulation wheels. The outer dually extension is too short by 2 inches. My old ones are longer and I can only think even though my rims are 19.5 they were the 22-24 inch model (8004). I did not purchase them. My simulation rims are made by wheel master and this extender is made by wheel master yet they do not work.In closing, these are just okay. If you have wheels bigger than 19 inches think twice.

Purchased this set in order to replace one of the previously owned extensions started leaking air. The replacement extension worked as advertised and is not leaking. I had been using the previously extension on my E-450 motorhome for three years.

So much easier to check pressure at every stop for gas and before going on a trip. Wheel Masters 8001 AM4 Stainless Steel Hub Mount - 4 Hose Kit for 16"-19.5" Wheels