C4030/DE4820 Filter Head With Clamp System discharge-pipe-size_12" These special bolt heads are

These special bolt heads are designed to ensure that swimmers do not injure themselves on traditional hex head bolts

Two hydrostatic relief valves per sump are required (see #170SP-10560)

This knob can also be switched with a handle in order to have double handles on your solar reel system

The 7-Day Time Switch Mechanism fits in all standard Intermatic time switch enclosures and swimming pool control panels

This pool depth marker states Slash (/) Symbol and is printed with 4 Inch letters and has an overall size of 6 Inch x 6 Inch

C4030/DE4820 Filter Head With Clamp System discharge-pipe-size_12" These special bolt heads areThis is a replacement Hayward Filter Head with Clamp System for SwimClear C4030 Cartridge Filter and Pro Grid DE4820 Vertical Grid DE Pool Filters.