CertainTeed's Certa-Lok PVC drop pipe offers a non-threaded, corrosion-resistant, ready-to-use coupling/spline-locking design; the joint eliminates the need to constantly rotate the drop pipe for assembly and disassembly. Available in sizes 11⁄2 inches to 8 inches, this drop pipe is suitable for deep- and shallow-well applications, including domestic wells, irrigation wells, municipal wells, recharge wells and test pumps. CertainTeed Corp., Card No. 23