Model 80SL Slim Line well check valves from Flomatic Corporation are designed to support the weight of up to 1,000 feet of pipe and well pump. Sizes range from 2 through 8 inches. Fusion epoxy coating is standard. The small outside diameter allows for tight fits in the well. The valves have a stainless steel body with corrosion-resistant internal parts. 800/833-2040; www.flomatic.com.