Swimline Supreme Guard Solid In Ground Winter Pool Cover - 30' x 55' Rectangle sandpro-4510-4511-series-filter Outer Diameter is 10 7/8"

Outer Diameter is 10 7/8" and Inner Diameter is 7"

One 9-volt battery (not included)

Manufacturer Part # A100GLL

Pair with Hayward OmniHub Smart Pool Control

Double wall

Swimline Supreme Guard Solid In Ground Winter Pool Cover - 30' x 55' Rectangle sandpro-4510-4511-series-filter Outer Diameter is 10 7/8"Swimline's Supreme Guard winter pool cover helps keeps your water free from dirt, leaves, and debris. It helps prevents algae growth, so you can skip the costly maintenance and avoid time consuming spring cleanups. 10 x 10 Scrim 5 foot overlap Pool Type In Ground Pool Size 30' x 55' Rectangle Cover Size 35' x 60' Rectangle Manufacturer Swimline Warranty 10 Year Manufacturer Pro Rated Warranty 1 Year Full Cover Color Green