Special models for liner pools, made of white ABS and treated for UV protection.
For use with liner, they include the adhesive gaskets, flanges and screws. The Parker model with self-tapping screws can also be used.
The latest models include a grill in which the holes are less than 8 mm, complying with current legislation. The “antivortex” models include a lateral suction grill to prevent whirlpools.