Fits Geoprobe® DT21 and DT22 dual-tube samplers — 1.375" OD. Dual-tube tooling keeps a cased hole open as you advance, which is what makes it the choice below the water table and in caving soils. If you're running DT21 or DT22, this is your liner.

An aftermarket replacement liner manufactured by Universal Plastics, a Geotech Environmental Equipment, Inc. company, from rigid clear PVC extruded in the USA. The liner captures a continuous, minimally disturbed core as the sampler is driven and retrieved — stratification is readable through the liner wall on the spot, and the sample reaches the lab intact.

Rolled Edge or Core Catcher — which do I need?

This is the most common question on direct push liners, and the answer comes down to one thing: will your soil stay in the liner on the way up?

• Rolled Edge — an open liner with a rolled, reinforced lip at the end. Nothing obstructs the bore, so you recover the full core diameter, the sample slides out clean, and the stiffened lip resists splitting as the tool is driven. This is the right default for cohesive soils — clays, silts, and damp sands that hold together as a plug and come up on their own.
• Core Catcher — adds a flexible basket at the bottom of the liner. Its fingers spread open as soil pushes in, then close beneath the core once driving stops, holding the sample in place during retrieval. Use it in non-cohesive ground — running sands, gravels, and saturated or loose material below the water table, where an open liner lets the bottom of your core slide back out into the hole. If you're pulling short recovery or losing the bottom of the run, this is the fix.
• Core Catcher, Not Drilled — the same retention basket, supplied without the factory set holes, for crews who drill their own hole pattern or don't use them. Offered in 4 ft.

Rule of thumb: cohesive soil above the water table, Rolled Edge is faster and cheaper. Sandy, gravelly, or saturated soil, the Core Catcher pays for itself the first time it saves you a re-drive.

Specifications

• Fits: Geoprobe DT21 / DT22 dual-tube samplers, 1.375" OD
• Lengths: 3 ft, 4 ft, 5 ft
• Styles: Rolled Edge, Core Catcher, Core Catcher (Not Drilled, 4 ft)
• Set holes: 0.2" and 0.39" diameter (drilled styles)
• Material: Rigid clear PVC, extruded in the USA
• Packaging: Sold by the case — 50 liners per case

Best for: continuous or depth-discrete soil sampling in unconsolidated or coarse-grained soils, including work below the water table where a cased hole is needed. Clear PVC suits metals, inorganics, general chemistry, and stratigraphic logging.

In the field: load the liner into the DT22 sampler before driving, advance to depth, then retrieve and cap both ends for transport — or split the liner open on site to log and sub-sample.

Direct Push Soil Liners — specifications (PDF)

These liners are aftermarket replacement parts manufactured by Universal Plastics, a Geotech Environmental Equipment, Inc. company. Universal Plastics and Geotech Environmental Equipment, Inc. are independent manufacturers and are not affiliated with, sponsored by, or endorsed by Geoprobe Systems, Inc. Geoprobe® and the sampler model designations referenced here are trademarks of their respective owner, used only to identify sampler compatibility.