The ESP PLUS pulls a 3 (or 4) foot long by 1.2 inch diameter sample in one plunge. It captures every sample in a plastic liner and can sample to 3 (or 4) feet. Sampling tube is driven by a 12.5 pound drop-hammer (or electric hammer) and retrieved with a foot-operated jack.
Replacement part. Sandwiched between lower end of sampling tube and cutting tip. Directs flow of soil into the liner. Without it, clay samples have a tendency to crumple the plastic liners.