Roller Block Assembly width_4 Inches It has the ability to

It has the ability to clean an Olympic size pool in as little as 5 hours and a junior Olympic size pool in 3 hours

Since it is a solid cover

thus decreasing its cleaning frequency

It is used to calibrate the Salt Water PockeTester

Roller Block Assembly width_4 Inches It has the ability toThe Duraflex Complete Roller Block Assembly attaches to the Fulcrum Stand Box (Item DF SB401C) and holds the Footwheel and Roller. This is one complete assembly. Two are required per Fulcrum Assembly. The Roller Block is not sold separately. It includes the following items: (1) Slide Bearing (DF 518) (1) Roller Clamp (DF 521) (1) Roller Bearing (DF 524) (1) Rubber Bumper (DF 515) (1) Anti Rattle Clamp (DF 516) (1) Tie Plate Bolts, Washers and Nuts (DF