Whale Marine BP3740 Gusher 10 Diecast Alloy 17 GPM Manual Bilge Pump with Underdeck Mount
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You have 30 days to request a return. All sale items are final sale.
The Whale Marine BP3740 Gusher 10 is a high-capacity manual bilge pump designed for fast pump-out and tough, corrosion-resistant construction. Built for underdeck installation with the correct model orientation, it delivers strong flow through a 1-1/2" hose connection for day-to-day bilge and waste transfer needs.
Key Features
- High-flow manual diaphragm bilge/waste pump (Gusher® 10) for standing-water pump-out
- Underdeck/through-deck or bulkhead mounting style (BP3740 configuration)
- Self-priming design for dependable pumping action
- Diecast alloy body with epoxy resin coating and stainless steel hardware
- Anodized diecast alloy construction for marine durability
- Lanyard for the removable handle for convenient operation and storage
- 1-1/2" (38mm) hose connection for straightforward plumbing integration
- Suitable for manual pump-out of effluent holding systems
Product Compatibility
- Bilge pump-out on boats (standing water)
- Manual pump-out of effluent holding systems
- Auxiliary manual pumping for marine waste transfer (as applicable to system layout)
Product Details
- Whale Marine BP3740 Gusher 10 Diecast Alloy 17 GPM Manual Bilge Pump with Underdeck Mount
- Manual diaphragm bilge/waste pump with high-flow capability (rated 17 US GPM / 65 ltrs/min)
- Hose connection: 1-1/2" (38mm) smooth hose connections
- Underdeck mount / thru-deck-bulkhead (BP3740 configuration)
- Materials & finish: anodized diecast alloy; epoxy resin coated; stainless steel hardware
- Operation: removable handle operated with lanyard; self-priming for reliable starts
- Flow-through use: designed to exhaust standing water only (for bilge applications)
Parts Desk Insights
Best Use Case: Ideal as a backup or primary manual pump for boats needing high-flow, self-priming bilge pump-out—especially when you want reliable manual operation and corrosion-resistant marine materials.
Common Issues: If pumping performance drops, verify (1) correct hose size (1-1/2" / 38mm) and secure hose clamping, (2) plumbing direction and discharge routing, and (3) that the pump is mounted for the intended BP3740 configuration (under-deck / thru-deck-bulkhead orientation). For any waste/effluent plumbing use, confirm chemical compatibility of your intended fluid with the pump materials before operating.
Related Products & Accessories
- Whale Gusher 10 Mk3 Manual Bilge Pump Service Kits (for diaphragm serviceable parts) - Browse the Whale Gusher 10 Mk3 service kit options to match your pump generation when you need replacement service parts (diaphragm and related assemblies).
- Whale Gusher 10 Handle / Underdeck Components - If you’re servicing the operating hardware, look for the correct Whale Gusher 10 handle and underdeck mounting components listed for the Gusher 10 Mk3 family.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.