Skimmer Lid Standard - 9-7/8 Inch - White Spectrum Gowler Starting Block Color/Setback Distance They have two-way valves (one

They have two-way valves (one inlet and one outlet) and are used to permit and shut off fluid flow

This Meyco pool safety cover is designed to fit a Rectangular 16 x 24 Foot Pool

American 395005

It operates like a computer with the multi-line screen displays and direct access to all menus and submenus

Furthermore

Skimmer Lid Standard - 9-7/8 Inch - White Spectrum Gowler Starting Block Color/Setback Distance They have two-way valves (oneThis is a Pentair White Skimmer Lid replacement. This round cover is 9 7 8 inches in diameter. It can be used with various Pentair skimmers such as the SwimQuip, Swimrite, Jacuzzi (New Style), and some Hayward Skimmers. Pentair's skimmer covers are engineered and manufactured to the highest standards of precision and quality to minimize installation time and maximize satisfaction.