The Schwarze® Roadpatcher™ list of standard features a vane feeder to meter the aggregate into the air stream by a positive air lock vane feeder which ensures consistent aggregate placement and an even emulsion coating. This system creates the highest quality patch available. The Roadpatcher™ achieves a 92% compaction rate without the use of compactors based on the Strategic Highway Initiative Testing and allows for immediate traffic flow. Come to the people you know, for the products you trust.