The kit comes with 3 pieces, a shroud that clamps around the sander just above the pad, a hose, and a converter.

The shroud is approximately 6 inches in diameter at the intake, permitting full range of motion for a 5 inch pad.  I have not used it with a 6-inch pad, but it should work if the pad has dust-collection holes.  The edge of this shroud is quite flexible, and it can be adjusted pretty close to the pad or farther away.  I have not noticed a difference in the amount of dust collected based upon the position of the shroud, although the instructions say that it should be "placed as close as possible to the top surface of the pad."  The outlet of the shroud is the Porter-Cable one-inch outside diameter standard.

The hose is 1 1/4 inch OD, with the intake fitting at 1 inch ID, so that it fits snuggly on all Porter Cable random-orbit sanders.  The hose outlet is 1 1/2 inch ID.  Both the hose inlet and outlet thread (in reverse) onto the hose, so it is easy to remove them to clean out the hose, to shorten the hose, or to make other adjustments.  The hose length is about 128 inches, without stretching, including inlet and outlet.  The small diameter of the hose makes it much more convenient to use with a hand-held sander than the larger size hoses of any of the various brands of shop vacuums, and, since it is only carrying dust, it works better as the air is moving faster.

It should be noted that the hose is longer than many of the power cords on Porter Cable Vacuums, so if using the power-triggered function of the vacuum, you may want to use a short extension cord or cut the hose shorter.  Otherwise you will constantly unplug the sander or disconnect the vacuum hose.  Tying the hose and cord together adds convenience if the hose and sander are always used together.  Velcro ties have worked best in my shop.

The adapter is perhaps the most complicated to figure out.  The small end is 1 1/2 inch OD or 1 3/8 inch ID.  The large end is 2 1/4 inch OD and 2 1/16 inch ID.  There are no instructions to tell you how to use this, only how to install the shroud on the sander.

If you have the Porter Cable vacuum (any model), remove the hose that came with the vacuum and use the converter directly in the vacuum, attaching the hose that came with the kit to the converter.  This is all friction fit, which means you can't pull the vacuum along with you as you move through your work unless you tie the vacuum hose to the vacuum.  This is easily done with a strap running around the vacuum, fastened with Velcro, and a second strap around the hose, with both straps connected.

The adapter also works to convert from my old Sears Craftsman bench belt-disk sander to the Porter Cable vacuum hose.

The Shop-Vac Universal Tool Adapter 90687 is useful for converting the hose to Shop-Vac.  It is 2 1/2 inch ID on one end with a 1 inch, 1 1/4 inch, 1 1/2 inch, and 2 inch OD on the other (or 1 1/4 and 1 1/2 ID also available in the inlet).  Thus a Shop-Vac hose can plug into the 90687 and the 90687 can plug into the Porter Cable adapter (if the 90687 is cut to its shortest length).  Or the hose in this kit can be plugged directly onto the 1 1/2 inch step of the 90687.  The 90687 cannot be plugged directly into the sander, by the way, but it can be plugged into the 1-inch dust port on the Porter Cable belt sander, although the result is unwieldy.  It can be cut down, however, to work as a transition between the Porter Cable Vacuum standard hose and the Porter Cable belt sander.  This is a vast improvement over the dust collection bag that comes with the sander.

One other hint, if you are having trouble getting a vacuum adapter to seal up properly because the male side is just a little too small for the female side, wrap layers of wide blue masking tape around the male side, adding layers until the fit is tight.  This is a surprisingly long-term fix, by the way.  Another hint is to dedicate adapters to each specific purpose and leave them with the machine, not the vacuum.  Life becomes easier when you don't have to search for a specific adapter that has fallen somewhere.

So, is there a problem with this kit?  I am not certain, but this is the second of these kits I have purchased.  The first kit had a shroud that failed.  That said, it took a long time to do it.  I was looking to see if I could figure out when I bought the first kit, but I think it was 15 or 20 years ago.  There was a life to the shroud.  The plastic turned brittle and soft and it disintegrated into chunks.  At the same time, both the hook and loop pad and the PSA pad disintegrated in the same way, along with the foam pad in the storage case.  All were stored in the metal case that came with the Porter Cable Random Orbit Sander.  I can determine nothing unusual about the environment where the sander was stored:  no chemical fumes and normal variations of temperature 50 to 100 degrees F.  So, unless there is some incompatibility between the plastics of these parts, there is a life to all of them.

It should be noted that the hose and adapter from the original kit still looks and performs great, but I now use them on a belt sander, so things work out.  It is almost as expensive, by the way, to purchase just the shroud from the parts store as to purchase this kit.  It would be great if Amazon started just supplying the shroud, as the price would become reasonable and it is the part that takes all of the abuse.

I hope this information helps you out!
The kit comes with 3 pieces, a shroud that clamps around the sander just above the pad, a hose, and a converter. The shroud is approximately 6 inches in diameter at the intake, permitting full range of motion for a 5 inch pad. I have not used it with a 6-inch pad, but it should work if the pad has dust-collection holes. The edge of this shroud is quite flexible, and it can be adjusted pretty close to the pad or farther away. I have not noticed a difference in the amount of dust collected based upon the position of the shroud, although the instructions say that it should be "placed as close as possible to the top surface of the pad. "  The outlet of the shroud is the Porter-Cable one-inch outside diameter standard. The hose is 1 1/4 inch OD, with the intake fitting at 1 inch ID, so that it fits snuggly on all Porter Cable random-orbit sanders. The hose outlet is 1 1/2 inch ID. Both the hose inlet and outlet thread (in reverse) onto the hose, so it is easy to remove them to clean out the hose, to shorten the hose, or to make other adjustments. The hose length is about 128 inches, without stretching, including inlet and outlet. The small diameter of the hose makes it much more convenient to use with a hand-held sander than the larger size hoses of any of the various brands of shop vacuums, and, since it is only carrying dust, it works better as the air is moving faster. It should be noted that the hose is longer than many of the power cords on Porter Cable Vacuums, so if using the power-triggered function of the vacuum, you may want to use a short extension cord or cut the hose shorter. Otherwise you will constantly unplug the sander or disconnect the vacuum hose. Tying the hose and cord together adds convenience if the hose and sander are always used together. Velcro ties have worked best in my shop. The adapter is perhaps the most complicated to figure out. The small end is 1 1/2 inch OD or 1 3/8 inch ID. The large end is 2 1/4 inch OD and 2 1/16 inch ID. There are no instructions to tell you how to use this, only how to install the shroud on the sander. If you have the Porter Cable vacuum (any model), remove the hose that came with the vacuum and use the converter directly in the vacuum, attaching the hose that came with the kit to the converter. This is all friction fit, which means you can't pull the vacuum along with you as you move through your work unless you tie the vacuum hose to the vacuum. This is easily done with a strap running around the vacuum, fastened with Velcro, and a second strap around the hose, with both straps connected. The adapter also works to convert from my old Sears Craftsman bench belt-disk sander to the Porter Cable vacuum hose. The Shop-Vac Universal Tool Adapter 90687 is useful for converting the hose to Shop-Vac. It is 2 1/2 inch ID on one end with a 1 inch, 1 1/4 inch, 1 1/2 inch, and 2 inch OD on the other (or 1 1/4 and 1 1/2 ID also available in the inlet). Thus a Shop-Vac hose can plug into the 90687 and the 90687 can plug into the Porter Cable adapter (if the 90687 is cut to its shortest length). Or the hose in this kit can be plugged directly onto the 1 1/2 inch step of the 90687. The 90687 cannot be plugged directly into the sander, by the way, but it can be plugged into the 1-inch dust port on the Porter Cable belt sander, although the result is unwieldy. It can be cut down, however, to work as a transition between the Porter Cable Vacuum standard hose and the Porter Cable belt sander. This is a vast improvement over the dust collection bag that comes with the sander. One other hint, if you are having trouble getting a vacuum adapter to seal up properly because the male side is just a little too small for the female side, wrap layers of wide blue masking tape around the male side, adding layers until the fit is tight. This is a surprisingly long-term fix, by the way. Another hint is to dedicate adapters to each specific purpose and leave them with the machine, not the vacuum. Life becomes easier when you don't have to search for a specific adapter that has fallen somewhere. So, is there a problem with this kit? I am not certain, but this is the second of these kits I have purchased. The first kit had a shroud that failed. That said, it took a long time to do it. I was looking to see if I could figure out when I bought the first kit, but I think it was 15 or 20 years ago. There was a life to the shroud. The plastic turned brittle and soft and it disintegrated into chunks. At the same time, both the hook and loop pad and the PSA pad disintegrated in the same way, along with the foam pad in the storage case. All were stored in the metal case that came with the Porter Cable Random Orbit Sander. I can determine nothing unusual about the environment where the sander was stored:  no chemical fumes and normal variations of temperature 50 to 100 degrees F. So, unless there is some incompatibility between the plastics of these parts, there is a life to all of them. It should be noted that the hose and adapter from the original kit still looks and performs great, but I now use them on a belt sander, so things work out. It is almost as expensive, by the way, to purchase just the shroud from the parts store as to purchase this kit. It would be great if Amazon started just supplying the shroud, as the price would become reasonable and it is the part that takes all of the abuse. I hope this information helps you out!