Pre-Crusher Compactors are trash compactors that handle bulky waste. Items like pallets, crates, and white goods. They are also a good solution for defective product destruction. Pre-Crushers are similar to stationary compactors, but with a retractable steel wall at the end of the charge box. The ram crushes material against this steel wall. Then the steel wall lifts and the crushed material packs into the receiving container.