Infiltrator Introduces TW-RisersThe 24-inch-diameter TW-Risers from Infiltrator Systems feature slip-resistant lids that fasten with stainless steel screws. The lids are further secured by indexing structural ribs that lock the riser pieces into place to ensure a watertight seal. Available in green or black in 6-, 12- or 18-inch heights, the risers are molded of glass-reinforced polypropylene. Infiltrator also offers EZset risers in 20-, 24- and 30-inch diameters. 800/221-4436; www.infiltratorsystems.com.Liberty Introduces Crawl Space Pump Kit The CSP-Series crawl space pump kit from Liberty Pumps is designed to remove groundwater from around foundations, crawl spaces and low lying areas. The sump basin
