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This specification provides standard fitting geometries and laying lengths for plastic fittings intended for use in drain, waste, and vent applications. (See Specifications D2661 and D2665.) Fittings meeting the requirements of this standard specification are designed for use with outside diameter controlled pipe. The inside diameter of pipe can vary significantly as the wall thickness and outside diameter varies and therefore is not suitable for use as a fitting socket. The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.