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.
This reusable spacer allows you to fit a 12 inch liner into an 18 inch Zero Contamination Tube. It would also fill the empty space in a 36 inch ESP Sampling containing one 12 inch and one 18 inch liner.
Remember the spacer sits on TOP of the PETG Copolyester or Stainless Steel liners inside your sampling tube.