This high-impact manhole shield is constructed of rugged, lightweight polyethylene with a bright yellow color that resists fading. This shield will fit 28", 30" and 32" diameter manholes with an inflatable seal that ensures a watertight fit. With 4-outrigger support gussets that stabilize the shield and 12" tall, this polymer shield is designed to keep water and mud out of manhole as you work. The 9401-12 manhole shield can be used with the Allegro guard rail and shield retainers.