Whale BP4772 Gulper Grouper MK3 Fishbox & Waste Discharge Pump | 4.2 GPM 12V
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You have 30 days to request a return. All sale items are final sale.
Whale BP4772 Gulper Grouper MK3 — Fishbox & Waste Discharge Pump
The Whale Gulper Grouper MK3 is a purpose-built 12V discharge pump designed for boats that need a reliable, clog-free solution for evacuating fishbox waste, bait tank water, or toilet holding tank discharge. With a 4.2 GPM flow rate and a 90° port orientation, it drops directly into tight spaces where standard macerator pumps won't fit — no adapters, no awkward hose routing.
Unlike traditional macerator pumps, the Gulper Grouper uses non-choke valve technology — meaning no impeller to jam, no filters to clean, and no motor burnout from debris. It handles the messy jobs on board without complaint.
Key Features
- 90° port orientation — direct drop-in replacement for most macerator pump installations in compact bilge or under-deck spaces
- Non-choke Gulper valve technology — no impeller, no filters, no clogged pump heads
- 360° rotating head — align hose connections in any direction for a clean, stress-free installation
- 4.2 GPM flow rate at 12V — moves waste efficiently without oversizing your electrical draw
- Easy to clean and maintain — tool-free access for routine service
- Dual-purpose capable — equally effective for fishbox/bait tank evacuation and toilet waste discharge
Best Use Cases
- Fishbox and bait tank drainage on sport fishing and charter boats
- Toilet waste discharge in compact heads compartments
- Replacing failed or clog-prone macerator pumps without re-routing hoses
- Any 12V DC marine application requiring a self-priming, debris-tolerant discharge pump
Parts Desk Insights
The MK3 is the current production revision of the Gulper Grouper line. The 90° port is the key differentiator from the standard Gulper Grouper — it's the right call when hose clearance is tight or the pump must mount flush against a bulkhead. If your application needs higher flow or a 24V system, see the Whale Marine Gulper Grouper 12V Evacuation Pump 6.5 GPM. For shower sump or galley waste applications, the Whale BP2052 Gulper 320 12V or Whale BP2054 Gulper 320 24V are better matched to those flow rates and duty cycles. SKU: 698-BP4772.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.