Unicel S-1900 Circular Spin Filter Grid - 19 Inches filter-length_19 1/8 inches This is a paddlewheel type

This is a paddlewheel type insertion flow sensor

The AquaStar FlowStar has 2-1/2 inch outside slip and 2 inch inside slip with 2 inch threads inside the skimmer for pressure testing

Nautilus NS and Nautilus Plus NSP 60 square foot filters

This is a Generic Strainer Cover and Tank O-Ring O-510 replacement with dimensions for Hayward NorthStar SP4000 and SP4000X pumps from 2003 to 2007

Unicel S-1900 Circular Spin Filter Grid - 19 Inches filter-length_19 1/8 inches This is a paddlewheel typeThis is a Unicel S 1900 Ciricular Spin Filter Grid, 19 Inches in diameter with a 2 1 2 inch center. This round grid FC 9910 is the correct replacement for the Unicel S 1900. This filter grid is made from heavy duty polyester. This grid has more pleats to improve filtering capacity.