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2. Pin Index Safety System - Wikipedia

   en.wikipedia.org/wiki/Pin_Index_Safety_System

   The pin index safety system uses a face seal between the cylinder valve and the associated yoke clamp. There are two holes in specific positions on the cylinder valve body below the outlet port , in positions associated with the gas mixture, which prevent connection of the cylinder to a yoke or pressure regulator with a mis-matched set of pins.

3. Oxygen sensor - Wikipedia

   en.wikipedia.org/wiki/Oxygen_sensor

   An oxygen sensor (or lambda sensor, where lambda refers to air–fuel equivalence ratio, usually denoted by λ) or probe or sond, is an electronic device that measures the proportion of oxygen (O 2) in the gas or liquid being analyzed. [1] It was developed by Robert Bosch GmbH during the late 1960s under the supervision of Günter Bauman. [1]

4. Venturi mask - Wikipedia

   en.wikipedia.org/wiki/Venturi_mask

   Venturi masks are used to deliver a specified fraction of inspired oxygen (F I O 2).Many masks are color-coded and have a recommended oxygen flow specified on them. [5] When used with this oxygen flow, the mask should provide the specified F I O 2.

5. 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.

6. O2 Store - Wikipedia

   en.wikipedia.org/wiki/O2_Store

   The O2 Store is a chain of retail stores operated by Telefónica Europe, specializing in mobile phones. As of January 2014, O2 has opened over 450 stores in the United Kingdom. [ 1 ] O2 Stores come in 2 formats - Franchise and Retail.