Grundomat 85P (3 1/3 in.) (New)

The GRUNDOMAT 85 P is a 3 1/3 in. pneumatic piercing tool built for trenchless installation of pipes, cables, conduit, and utility lines. Powered by compressed air, this cylindrical air-hammer drives through the ground to create a clean underground bore without open-cut trenching.

What contractors use it for: boring under a driveway, sidewalk, road, or parking lot to install water service lines, electrical conduit, gas lines, irrigation and sprinkler lines, and fiber optic drops — no trench, no cut concrete, no landscaping repair. A typical residential driveway crossing takes minutes of boring time with a 32 CFM compressor.

Also known as: underground mole, boring missile, air mole, ground piercing tool, horizontal boring tool, trenchless bore tool, pneumatic gopher. Whatever your crew calls it — this is the 3 1/3 in. class tool.

As a pneumatic mole, the GRUNDOMAT 85 P performs well in displaceable soils such as sand, loam, and gravel, including soil conditions with fracturable rocks. It is not designed for solid rock or unfracturable rocks, and very soft soils may affect accuracy because the tool’s own weight can cause deviation.

Grundomat 85P Specifications

Package Options

• Tool only (P/N GP0850030) — the boring tool itself, for crews that already have an air hose and lubricator.
• Basic package (P/N 07076934) — tool, 50 ft. air supply hose, in-line lubricator assembly, 1 gallon Grundo-Oil tool lubricant, magnetic starting level, operator’s & parts manual.
• Deluxe package (P/N 07060434) — everything in the Basic package plus a maintenance tool box matched to the 85P: spanner wrench pair, replacement spanner pins, liquid Teflon, seal compression clamp, roll pin punch, 277 threadlocker (10 ml), primer (2 oz), and roll pin kit.

Part Number Cross-Reference

GP0850030 — GRUNDOMAT 85P, tool only · 07076934 — GRUNDOMAT 85P, basic package · 07060434 — GRUNDOMAT 85P, deluxe package. Need the compact version? See GRUNDOMAT 85PK: GKP0850028 / 07076933 / 07060433.

Ships from our US warehouse — backed by warranty.

The GRUNDOMAT 85 P is a practical choice for contractors who need reliable underground piercing performance, less surface damage, and efficient setup for everyday utility installation jobs.