Learn More OPP-300 The OPP-200 backfill separation machine is designed to backfill large diameter mainline pipelines ranging from 10 to 24 inches in diameter. Learn More OPP-200 The ... ALLU buckets can screen, crush, pulverize, aerate, blend, mix, separate, feed, and load materials. ... For Australia & New Zealand. Please click here. SIGN UP ...