Blackburn GR34-4010 PIGTAIL CONN, 3/4IN ROD, 99H DIE

Yes. The GR34-4010 is built for 3/4 inch ground rod, which is the most common rod diameter used for driven electrodes in commercial and residential service grounding. It is a compression pigtail connector, so it is crimped onto the rod rather than bolted, and the copper pigtail lead comes off the connector ready to splice or bond to the grounding electrode conductor.

It takes a 99H die. That is the die index stamped for this connector, so your compression tool head needs to accept 99H before you get on the job. Using a different die index on a grounding compression connection is how you end up with a crimp that will not hold up to a fault current test.

It carries UL E3060 plus CSA 4503 and CSA 2884. Those are the listings an inspector or a spec-driven institutional buyer will be looking for on a grounding electrode connection, and they are the reason this style of compression connector gets accepted where a mechanical clamp may not be.

A bolted acorn clamp is the quicker field fix and can be taken apart later. A compression pigtail like the GR34-4010 is an irreversible crimp: once it is on the 3/4 inch rod it cannot back off, loosen from vibration, or be removed without cutting, which is why it gets specified for direct-burial and concrete-encased grounding where nobody will ever inspect the connection again. The trade-off is you need the compression tool with a 99H die on site.

The conductor is copper, which is what you want in contact with a copper-bonded ground rod. Keeping the connector, the pigtail, and the rod all in the copper family avoids the galvanic mismatch you get when dissimilar metals sit together in wet soil.

It is sold each, so you can order the exact count you need per rod rather than buying a full carton. For crews grounding a run of poles or pads, order one per rod plus spares, since a miscrimped compression connector cannot be reused.

Blackburn GR34-4010 is the manufacturer part number, part of Blackburn's E-Z-Ground compression grounding line. Country of origin is Mexico. Distributors cross-referencing should order against GR34-4010 exactly, since the die index and rod size are baked into the number.