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### Quick Answer

**The pipe-fitting formula for a 45-degree offset in plumbing is the length of a diagonal connector, known as the travel, times 0.707.** To calculate rolling offset, when a pipe changes direction both vertically and horizontally, it is necessary to find the values for true offset, the setback and the diagonal.

True offset is found by squaring the offset and adding the square of the rise value to equal the true offset squared. The square root is then found to determine true offset. With true offset determined, a pre-existing table can be used to find setback and diagonal values.

Plumbing often involves working on pipes hidden behind walls, in small utility rooms or in other tight spaces. Plumbers often work without direct access to pipes, for instance when working with underground sewer lines. In some cases, cameras are sent in to assess problems, and then plumbers use pumps lowered with cables to execute pipe replacements.

Understanding some math, especially geometry, is necessary for plumbers who must calculate exact angles for pipes and their fittings. The Pythagorean theorem is used in plumbing to find the value for true offset. The theorem holds that in a right triangle, the square of the side opposite the right angle equals the sum of the squares of the other two sides.

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Q:
## How do you determine the PVC pipe dimensions that fit your house plumbing needs?

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Full Answer >**If you are repairing or adding to existing plumbing you must properly measure the existing lines, but if you are running new pipe, your local building code specifies what must be used.**Typically, main lines are 3/4 to 1 inch, supply lines are 3/4 inch and fixtures use 1/2 inch.Filed Under: -
Q:
## What is a plumbing riser?

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Full Answer >**A riser is a supply line, usually made of metal or plastic that is intended to connect a faucet or shower fixture to the stop valve of the water supply.**Plumbing risers are commonly made of copper. Metal flex risers, however, are actually corrugated, which allows them to be bendable.Filed Under: -
Q:
## What are some do-it-yourself plumbing diagrams?

A:Plumbing diagram examples are widely available on construction and plumbing websites. Books that explain basic and complicated plumbing projects, such as "Practical Plumbers' Work" by Paul N. Hasluck, are available at local and online bookstores.

Full Answer >Filed Under: -
Q:
## What are plumbing blueprints?

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Full Answer >**Plumbing blueprints are blueprints that specifically pertain to the location of the plumbing fixtures in a building.**The blueprints show the location of gas lines, pipes, drains and vents as well as the size and number of sinks and toilets.Filed Under: