The decision problem
Marine pumps, plumbing, and sanitation choices usually come down to moving water and controlling flow. A bilge pump has to clear water quickly, a transfer pump has to move it from one place to another, a strainer has to block debris before it reaches raw-water equipment, and a seacock has to shut off a through-hull line. Because these products do different jobs, picking one without knowing which job you are solving is where most buyers go wrong. This guide compares four marine components: the Groco FBV-Series seacock, SEAFLO's bilge pump, Eurowagens' marine water intake strainer, and TruePower's utility transfer pump. The price spread is equally important: the TruePower pump sits at $54.99, while the Groco seacock sits at $605.85, so the right choice is as much about application as budget.
Quick take
The four products cover different roles and price points. SEAFLO is the high-capacity pump for keeping a bilge dry. TruePower is a smaller utility pump that comes with an extra impeller. Eurowagens makes the seawater intake strainer for protecting plumbing. Groco offers the large seacock for through-hull shutoff.
Listed price comparison
Here is how the four stack up by listed price.
| Product | Listed Price | Price Bar | Why you'd consider it |
|---|---|---|---|
| Groco FBV-Series 3" NPS Flange to 3" NPTF Bronze Seacock | USD 605.85 | Large bronze through-hull shutoff | |
| SEAFLO 01 Series 4700 GPH Bilge Pump 12V, 2" Outlet | USD 99.99 | High-volume submersible bilge pump | |
| Eurowagens Marine Water Intake Strainer Seawater Boat Plumbing Fittings | USD 145.52 | Raw-water intake screen for seawater plumbing | |
| TruePower 12V DC Utility Transfer Pump 240 GPH Stainless Steel | USD 54.99 | Small utility and bilge transfer pump |
Decision matrix
| If you are facing... | Start here... |
|---|---|
| A flooded bilge that needs fast, high-volume pumping | SEAFLO 01 Series Bilge Pump |
| Small-scale transfer, draining, or emergency water removal | TruePower Utility Transfer Pump |
| Seawater intake protection in a plumbing line | Eurowagens Marine Water Intake Strainer |
| A large shutoff for a through-hull | Groco FBV-Series Seacock |
Product notes
Groco FBV-Series 3" NPS Flange to 3" NPTF Bronze Seacock
The Groco seacock is a dedicated through-hull shutoff, not a pump or filter. It uses a 3-inch NPS flange-to-threaded connection that ends in 3-inch NPTF, so it is built for large raw-water or discharge lines. Bronze construction fits a seawater component, and a California Prop 65 warning applies to this part. This seacock earns its place when you need a sizable shutoff that matches 3-inch plumbing. The limitation is that it serves only that role; it will not pump water, filter it, or adapt to a different pipe size without additional fittings.
SEAFLO 01 Series 4700 GPH Bilge Pump 12V, 2" Outlet, Marine, CE & RoHS Certified
SEAFLO's 01 Series pump is the high-volume choice in this group. It is rated for 4700 gallons per hour through the 2-inch outlet, which gives it far more water-movement capability than the TruePower unit. It is a submersible pump with a snap-off strainer base to keep debris out, and anti-airlock protection addresses trapped air that can stall a bilge pump. It is also CE and RoHS certified and carries a four-year limited warranty. Grab this pump when your priority is moving a lot of water quickly from a bilge or sump. The practical limitation is the electrical demand: up to 32.1A at max load, so wiring and battery bank need to be sized for that draw.
Eurowagens Marine Water Intake Strainer Seawater Boat Plumbing Fittings
The Eurowagens strainer handles a different part of the marine plumbing system. It is a water intake strainer for seawater plumbing, meant to keep debris out of raw-water intake lines before water reaches a pump or other component. It carries a 12-month warranty, which is helpful for a part that gets regular saltwater exposure. This strainer belongs on a build when you are servicing a seawater intake path and need protection for downstream equipment. The catch is that it is a strainer only: it does not pump, and it will not stop flow the way a seacock does. It simply filters what passes through.
TruePower 12V DC Utility Transfer Pump 240 GPH Stainless Steel Bilge Marine Extra Impeller
TruePower's utility pump is the most specialized of the four. It is rated for 240 gallons per hour, so it is best for transferring water, draining a small boat, or handling an emergency water removal job rather than clearing a large bilge. The stainless steel housing adds durability for a pump that may be used periodically, and the included extra impeller gives you a spare part ready when needed. Its threaded connections, a 3/8-inch NPT female inlet and 3/4-inch NPT male outlet, make it adaptable to common hose setups. Reach for this pump when you want a small utility pump for transfer work, not a primary high-volume bilge pump. The trade-off is the relatively low flow and 23-foot maximum head, which limit how far it can push water upward.
Final recommendation by use case
If you need high-volume bilge pumping, choose the SEAFLO 01 Series. For utility transfer and small-boat draining, the TruePower pump is the better fit. If seawater intake protection is the gap in your plumbing, go with the Eurowagens strainer. For a large through-hull shutoff, the Groco FBV-Series seacock is the component to specify.
