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2. Thread seal tape - Wikipedia

   en.wikipedia.org/wiki/Thread_seal_tape

   These color-codes for thread sealing tape were introduced by Bill Bentley of Unasco Pty Ltd in the 1970s. In the UK, the tape is used from coloured reels, e.g. yellow reels for gas, and green for oxygen. White: used on NPT threads up to 3 ⁄ 8 inch; Yellow: used on NPT threads 1 ⁄ 2 inch to 2 inch, often labeled "gas tape"

3. AN thread - Wikipedia

   en.wikipedia.org/wiki/AN_thread

   The Air Corps-Navy involvement is also the origin of the red/blue color combination that was traditionally used in the anodized finishing process. [ 1 ] AN sizes range from -2 (dash two) to -32 in irregular steps, with each step equating to the OD (outside diameter) of the tubing in 1 ⁄ 16 -inch increments.

4. North American Fire Hose Coupler Incompatibilities - Wikipedia

   en.wikipedia.org/wiki/North_American_Fire_Hose...

   At its annual convention at Dallas, TX, the NFPA formally adopted a standard with 2 + 1 ⁄ 2-inch hose with 7.5 threads per inch as the primary standard, with additional sizes of 3 and 3.5 inches (each with 6 threads per inch) and a 4.5 inch coupling with 4 threads per inch, with the fire hydrant standard specifying one 4.5 inch port and two 2 ...

5. Hose coupling - Wikipedia

   en.wikipedia.org/wiki/Hose_coupling

   A hose coupling is a connector on the end of a hose to connect (or couple) it with another hose or with a tap or a hose appliance, such as an irrigation sprinkler. It is usually made of steel , brass , stainless steel , aluminium or plastic .

6. Self-amalgamating tape - Wikipedia

   en.wikipedia.org/wiki/Self-amalgamating_tape

   This type of tape is also described, particularly in the United States, as "self-fusing", [3] [4] or "self-vulcanizing". In the US Air Force (and elsewhere) it is called centerline tape due to a colored line running down the center used to assist with even wrapping. It is sold under a variety of brand names, including "F4 tape", "Tommy Tape ...

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   mail.aol.com

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