The ideas presented here are protected by US Patents 7,819,345, 7,942,350, and 9,561,393.
Also, Canadian Patents 2,693,158 and 2,891,833.




IMPORTANT NOTE
My patents are only for the USA and Canada. If you are not in the USA and Canada, I encourage you to build and sell my inventions. You will pay me nothing. I will help you design the systems. When people in the USA and Canada see your systems they will want to buy them, and then you will have to pay me modest royalties.



Start with a 2 inch inner diameter PVC pipe.
Cut a piece that is 3 1/2 in (90 mm) long.

Then draw two parallel lines that are 7/8 inch (22 mm) apart.
I measure with a flexible tape that is in full contact with the PVC.


A Dremel tool is used to cut the PVC along the two parallel lines.
This pack of Dremel compatible saw blades in available from Harbor Freight Tools for approx $10.
They are what I use.
The PVC has been cut with Dremel tool.
 
 

The red hose on the left is used as a stencil to draw a
rectangle onto the PVC.

The stencil is 3 1/2 in (90 mm) by 7 1/8 in (180 mm).

The desired rectangle on the PVC should be
 2 in. (51 mm) long and 1 1/4 (32 mm) high.

The center of the rectangle is located 1/3 of the 7 1/8 inches down from the top of the photo.



The stencil is wrapped around the PVC in the manner shown.
This is done so that the rectangular hose hole does not get close to the meeting point of the PVC when the PVC is clamped as tight as possible. If they were close, there is the risk of a leak.




The rectangle has been drawn on the PVC.

The rectangle is 1/3 of the PVC away from the gap.
 
 


The Dremel is used to cut the rectangle.





The hose is put through the PVC, and since the hose is a lay flat type, the flat part of the hose stays on the ground and the rectangle is oriented upwards.




Draw a line on the hose next to the PVC on both sides of the PVC.

This will be the outer boundary for  a 1 inch wide belt sander to remove the top layer of the hose under the PVC. If the top layer of the hose is not removed, the glue will not be effective.









Two sections of any length PVC with 7/8 in gaps are placed around the location of where the hose will have its surface sanded by the 1 inch wide sanding belt. Then hose clamps are tightened so that the PVC forces the hose into a circular shape to help sand the hose evenly.





Each PVC is held in a hand and the hose is GENTLY pressed against the sanding belt and rotated. Try to avoid sanding down significantly into the fabric (that is making an appearance in the photo).

It is best NOT to let the PVC touch to table portion of the sander because the rotation will be snagged and deep cuts will be made in the hose. If a deep cut is accidentally made, the assembly can be slid an inch or two to the right or left where a new section will be sanded. The section with the deep cut can be hidden under some PVC which will give it the strength it may have lost.

When building a long hose with a PVC every 10 feet, the assembly can be slid from one location to the next.


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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