Question

when installing push - to - connect fittings, it is helpful to remember that
they are designed to be removed and reused a number of times.
incise marks placed by the manufacturer on the tubing must be avoided.
they can typically be unlocked using a magnet.
a witness mark can be made by simply inserting the tubing firmly into the fitting.

Explanation:

Los accesorios push - to - connect están diseñados para ser removidos y reused varias veces. No hay necesidad de evitar marcas incisivas hechas por el fabricante, no se desbloquean con un imán y hacer una marca de prueba no es tan simple como insertar el tubo en el accesorio.

Answer:

they are designed to be removed and reused a number of times.