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2. Suction cup - Wikipedia

   en.wikipedia.org/wiki/Suction_cup

   The working face of the suction cup is made of elastic, flexible material and has a curved surface. [3] When the center of the suction cup is pressed against a flat, non-porous surface, the volume of the space between the suction cup and the flat surface is reduced, which causes the air or water between the cup and the surface to be expelled past the rim of the circular cup.

3. Backflow prevention device - Wikipedia

   en.wikipedia.org/wiki/Backflow_prevention_device

   Backflow prevention device. The simplest, most reliable way to provide backflow prevention is to provide an air gap.An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool.

4. Trap primer - Wikipedia

   en.wikipedia.org/wiki/Trap_primer

   A trap primer (or trap seal primer) is a plumbing device or valve that adds water to traps.The water seals in traps are needed to prevent sewer gases from entering buildings, but because this water is exposed to the air, it is subject to evaporation over time in infrequently used floor drains, leading to the release of sewer gas into the environment.

5. Bidet shower - Wikipedia

   en.wikipedia.org/wiki/Bidet_shower

   A bidet shower in a hotel bathroom in Helsinki, Finland. A bidet shower—also known as a handheld bidet, commode shower, toilet shower, health faucet, bum shower, jet spray, hand shower, shatafa (from the Arabic: شَطَّافَة [ʃɑtˤˈtˤɑːfɑ], "hand shower rinser") or bum gun—is a hand-held triggered nozzle that is placed near the toilet and delivers a spray of water used for ...

6. Grip (gymnastics) - Wikipedia

   en.wikipedia.org/wiki/Grip_(gymnastics)

   This bump, in conjunction with the bar, forms a detent that leverages the gymnast's grip, thus reducing the hand pressure needed to maintain a hold on the apparatus. The wrist strap is used to secure the grip on the gymnast's hand and to transfer body weight from the fingers to the wrist.