NRG filler blocks for 720 chain attachments and flights are precision molded from tough, wear resistant polypropylene to ensure proper alignment between the flight and attachment link. 720 Filler blocks come in two sizes, FB-6 and FB-8 for corresponding nominal flight depths.

Polyurethane filler block FBH78-4 and FBH78-6 are also available for H78 F2 attachment paddles, and will run on 6" or 4" flights. Filler blocks act as spacers between the flight and the F22 attachment link, providing rigidity and negative buoyancy. Filler block holes are ASTM standard spacing, and holes are sized to accommodate 3/8" flight hardware.


FB-8

 FB-6