R-3498 Series castings meet or exceed FAA requirements

for manhole covers per Advisory Circular AS150/5320-6D.

Lids are fastened to frames.

Lids are hinged and furnished with hold-open safety device.

Stainless steel torsion spring lift assist available - order as noted.

The following lids are furnished in Austempered Ductile Iron.

Austempered Ductile Iron Lids

meet FAA material requirements per Advisory Circular AS150/5370-10A.

Exceptional strength to weight ratio.

Lighter lids require less effort to open.