The Groz GNB-25/3R/SPL is a heavy-duty, cast iron rotary barrel pump regarded globally as a workshop standard for high-volume fluid transfer. Its "SPL" designation refers to its specific configuration, which includes a 3-piece rigid suction tube and a steel discharge spout, making it ideal for 50L to 210L drums.
Technical Specifications
- Flow Rate: 5 Liters per 20 turns (approx. 250ml per revolution).
- Inlet Thread: 1" BSPT.
- Wetted Components: Cast Iron, Steel, and NBR (Nitrile Rubber).
- Suction Tube: 3-piece threaded rigid steel pipe
- Weight: 6.6 kg (indicates heavy-duty cast construction).
- Drum Fitment: Includes a 2" cast iron bung nut for standard barrels.
Key Features
- Dual-Directional Operation: Unlike many budget pumps, this unit can both empty and refill containers simply by reversing the direction of the handle rotation.
- Cast Iron Vanes: The internal vanes are precisely machined from cast iron (not plastic), ensuring a much better vacuum draw and a smoother, more consistent flow of heavier oils.
- Rugged Construction: The sturdy body is built for industrial environments. It is significantly heavier and more durable than aluminum or plastic alternatives.
- Contamination Protection: Features a rubber boot on the discharge spout connection to keep rainwater and dust out of the pump mechanism when not in use.
Recommended Fluids
This pump is designed for non-corrosive, petroleum-based fluids:
- Fuels: Diesel, Kerosene, and Heating Oils.
- Oils: Motor Oils, Transmission Fluids, and Lubricating Oils up to SAE 90.
- Other: Paraffin and other non-corrosive media.
CRITICAL SAFETY: Do NOT use this pump with Gasoline (Petrol), Water-based media, Antifreeze, Solvents, or Acids. Using gasoline in a standard NBR-sealed cast iron pump can create static electricity risks and cause the seals to fail.
Usage & Maintenance Tips
- Priming: When using for the first time or after a long period of storage, "prime" the pump by pouring about 30ml of the oil you are pumping into the outlet. This creates the initial seal needed to pull fluid up the suction tube.
- Bung Nut Security: Ensure the 2" bung nut is tightened properly into the drum. If air leaks in through the bung, the pump will lose its "prime" and struggle to lift the fluid.
- Handle Care: Do not force the handle if it becomes stuck. This usually indicates a piece of grit is trapped in the vanes. Back-turn the handle slightly to dislodge the debris.
- Seal Longevity: If you are pumping "dry" fuels like kerosene frequently, it is a good idea to occasionally pump a small amount of lubricating oil to keep the internal NBR seals supple.
