Our verdict
The Todd holding tank is a solid, no-frills marine sanitation solution built from tough, odor-resistant polyethylene that stands up well to years of pump-out cycles and onboard conditions. While its rigid shape demands some planning around bilge space and you may need to source a few extra fittings, it remains a dependable choice for boaters wanting a long-lasting, low-maintenance waste tank upgrade.
Why it made the list
- Odor-resistant construction
- Durable rotomolded build
- Multiple fitting options
Pros & cons
What we like
- Odor-resistant polyethylene prevents permeation better than old fiberglass tanks
- Lightweight compared to metal tanks, easing installation
- Wide variety of port placements simplifies plumbing runs
- Durable construction resists cracking from pump-out vacuum pressure
- Backed by a well-known marine sanitation brand
Watch out for
- Rigid shape can make fitting into tight, irregular bilge spaces difficult
- Fittings sometimes require additional hardware not included in box
- Larger capacity models are bulky and heavy once filled
- Gauge strip accuracy can degrade over time with buildup
Spec sheet
| Capacity | 20-40 gallons (model dependent) |
|---|---|
| Material | Rotomolded polyethylene |
| Fitting Ports | 3-5 ports (inlet/vent/pump-out/gauge) |
| Color | Opaque white or translucent |
| Weight (empty) | 12-22 lbs |
Features at a glance
- Rotomolded polyethylene construction for corrosion resistance
- Multiple fitting ports for inlet, vent, pump-out and gauge
- Baffled interior to reduce sloshing and odor permeation
- Translucent gauge strip option for level monitoring
- UV-stabilized material for long-term outdoor/below-deck use
- Available in multiple gallon capacities to fit varied hull spaces
Full review
The Todd holding tank is a purpose-built waste storage solution engineered for boat owners who need a dependable, marine-grade system for managing onboard sanitation. Constructed from rotationally molded, seamless polyethylene, this holding tank resists cracking, corrosion, and the harsh effects of saltwater exposure that often degrade lesser materials over time. Its rugged one-piece design eliminates weak seams where leaks typically occur, making it a trusted choice for vessels ranging from small cruisers to larger offshore boats. The tank is designed to integrate seamlessly into existing marine plumbing systems, with fittings and ports positioned for straightforward connection to deck pump-out hardware, vent lines, and discharge through-hulls.
Available in a range of capacities, the Todd holding tank accommodates different boat sizes and crew needs, allowing owners to select a configuration that fits snugly into tight hull compartments without sacrificing storage volume. The molded baffles inside help control the movement of waste and liquid as the boat rolls with waves, reducing sloshing noise and minimizing stress on the tank walls during rough water conditions. Mounting tabs and reinforced fitting bosses are built into the shell, simplifying installation whether it's a factory retrofit or an aftermarket upgrade during a plumbing overhaul. Boat owners appreciate that the tank's translucent or marked wall sections, depending on the model, make it easier to monitor fill levels and plan pump-out schedules accordingly.
Beyond its physical construction, the Todd holding tank is valued for the role it plays in keeping marine sanitation systems compliant with waterway regulations, helping boaters avoid discharge violations in protected or no-discharge zones. Its compatibility with standard hose sizes, vent fittings, and deck plates means it works well alongside other components in a complete marine plumbing setup, including macerator pumps, Y-valves, and odor-control vent filters. For anyone maintaining or upgrading a boat's waste management system, this holding tank offers a combination of durability, practical capacity options, and ease of integration that makes it a staple choice within the boating and marine accessories plumbing category.
Ready to rig it?
Todd Marine Holding Tank
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