- PROFILE PRODUCT RANGE SPRINKLER SYSTEM HDPE PIPES Poly Propylene (PP) Plumbing Pipe HDPE COILS The PLB HDPE DUCTS Nozzle: Model - L.P. Model - H.P. Model - H.H.P. Model - R.G. Model - L.G. Model - E.L.G. Model - P.C. Model - G.S. Model - F.S. FITTINGS OTHER USES QUALITY CONTACT US A new name in low cost, high yield, modern-irrigation systems. Sterling Irrigations Limited was established in 1994, ...www.sterlingirrigations.com