Profile: Sierra Sales and Management Co. designs & distributes engineered process supplies, including polyethylene tanks. We market poly safe double wall tank systems, poly containment basins, horizontal and cone bottom tanks & plastic lined steel pipes, fittings & valves. Our polyethylene vessels are rotomolded, seamless and chemical resistant. We also offer crossed linked poly tanks and used oil collection tanks. We fabricate plastic lined pipe and fittings. Our polyethylene tanks come in all configurations, poly upright, vertical, cone bottoms, conical, horizontal and horizontal leg tanks. We also supply containment and double wall environmentally safe poly chemical storage tanks. Our tanks are rotomolded in hdpe, high density polyethylene, hdxlpe, crosslinked poly, and polypro, polypropylene. We have poly cone bottom tanks as small as 10 gallons up to 11,500 gallons. We stock poly containment basins in sizes from 5 gallons to 10,000 gallons.