Geoprobe GS-1000 series Grout System: Convenient, reliable, self-contained, compact and easy to use. This grout system was designed specifically for Direct Push Applications to properly install monitoring wells and probe hole abandonment to protect groundwater quality. This grout machine delivers standard ASTM grout through standard 1" diameter probe rods or through 3/8" polyethylene tubing. The powerful reciprocating pump is rated at 1000psi, with flow rates from 0.9 to 2.3 gpm. Ideal for Oxygen and Hydrogen release compound injections. Grout wells up to 4" in diameters for well abandonment purposes.