A lightweight acetal surge block sized to press-fit over a 2" standard-flow foot valve, boosting its outside diameter to about 1.875" for a snug surge fit inside 2" well screens. Use it to develop and clean monitoring wells — surging near the top of the screen and working down as turbidity drops, pulling silt and fine sediment out of the sand pack before sampling.

Compact, corrosion-resistant acetal construction; sold as an add-on accessory for foot valve/inertial pump well-development setups.