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2. National pipe thread - Wikipedia

   en.wikipedia.org/wiki/National_pipe_thread

   American National Standard Straight Pipe Thread for Hose Couplings ... This means that NPT fittings should be burr-free and lubricated using ... 8 0.12500000 3.1750 5 ...

3. AN thread - Wikipedia

   en.wikipedia.org/wiki/AN_thread

   A 37° flare type end fitting for flexible hose The AN thread (also A-N ) is a particular type of fitting used to connect flexible hoses and rigid metal tubing that carry fluid. It is a US military-derived specification that dates back to World War II and stems from a joint standard agreed upon by the Army Air Corps and Navy, hence AN.

4. Chevrolet small-block engine (first- and second-generation)

   en.wikipedia.org/wiki/Chevrolet_small-block...

   Its solid-lifter cam, known as the "30-30 Duntov" cam named after its 0.03 in (0.8 mm)/0.030 in hot intake/exhaust valve-lash and Zora Arkus-Duntov (the first Duntov cam was the 0.012 in (0.3 mm)/0.018 in (0.5 mm) 1957 grind known as the '097, which referred to the last three digits of the casting number) the "Father of the Corvette", was also ...

5. Heated hose - Wikipedia

   en.wikipedia.org/wiki/Heated_hose

   Heated hoses are suitable for environments from -40°C to 80°C and can be used in explosion-proof zones 1/21 and 2/22, if required. [3] A heated hose consists of a flexible hose, through which the media is pumped. This hose determines the resistance against temperature and chemicals.

6. Block heater - Wikipedia

   en.wikipedia.org/wiki/Block_heater

   An early automotive use was the "head bolt heater", invented by Andrew Freeman in the United States and patented on 8 November 1949. [ 1 ] [ 12 ] [ 13 ] These early heaters replaced one of the engine's head bolts with a hollow, threaded shank containing a resistive heating element.

7. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   This fitting (also known as a "bungalow fitting" or a "cottage fitting") is a sanitary tee that allows two trap arms to be connected at the same level. A toilet is the main connection, with the option of a right or left-hand outlet to the 3" inlet with a choice of 1-1/2" or 2" in size.