ADS 2912AG02 12" x 24" Nyloplast Extension. Nyloplast fittings for pipe connections are available for numerous applications including: 4” (100 mm) - 36” (900 mm) and include, but are not limited to: couplers, cleanouts, downspout adapters, elbows, End Caps, tees, wyes, tee-wyes, increasers, sanded manhole adapters, SCH-40 adapters, and SWR adapters.