The silver flexible pipes of the water are in such a way that the end part is in the form of a wrench, which can be used to hold the pipe body with a wrench to prevent the pipe from wrapping around itself and tighten the nut with another wrench.

PEX PRO water hoses are the best flexible stainless steel water hose on the market, being both burst proof & rust proof guaranteed!
Flexible plumbing lines are great for water flow, but they're not commonly accepted for drains. They're hard to clean and they can't form the powerful P-trap that allows for our sink drains to run without the influx of sewer gases.
Flexible plumbing hoses, or flexi-hoses, are rubber pipes surrounded by braided lengths of stainless steel. They're used to connect water to taps and fixtures, so you'll usually find them under the sinks, in your bathroom, laundry, or kitchen.
PVC is a popular material for flexible hoses because it is cost-effective, lightweight, and has good resistance to chemicals and UV light. PVC hoses are often used in applications where they are subjected to high levels of pressure and temperature, and they are also suitable for use in food and medical applications.
Builders have used flexible pipe plumbing for radiant heating systems for some time and it is now frequently used to run water supply lines.