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Standard dimensions for class 3000 full-pipe coupling include 1 1/4 and 3/4 inch for 1/8-inch pipe, 1 7/8 and 1 1/8 for a 1/2-inch pipe, and 3 3/8 and 3 for 2-inch pipe. Other coupling classes have different standard dim... More »

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The "Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120 guide," also listed as the ASTM D1785, lists the outside and inside diameters and wall thicknesses for PVC and CPVC pipes... More »

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Polychloride vinyl fittings, sized similarly to pipes of the same material, vary by diameter and wall thickness. The difference between the outside and inside diameters are generally standardized into one of two dimensio... More »

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A compression fitting is a coupling used in plumbing to connect two pipes or a pipe to a fixture or valve. These fittings are generally used on stationary connections, such as toilets, vanities and refrigerators. More »

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To repair a pinhole leak on a copper pipe, first turn off the water, drain the pipes, cut out the affected area and solder on a new pipe coupling. Using a coupler is acceptable for pinhole leaks where less than 1/2-inch ... More »

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Temporary repairs can be made with rubber-coated tape or Goop, but to permanently seal a leak in a PVC pipe, use regular PVC adhesive and a coupling. The adhesive and coupling can be purchased at a hardware store or anyw... More »

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Find an NPT chart that shows threads per inch and drill size by going to the national pipe taper threads page on The Engineering Tool Box web site and scrolling down to the chart. In addition to threads per inch and dril... More »

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