Marine Water & Waste Holding Tanks and Accessories

At AquaStar Distributors, we have a variety of marine water and waste holding tanks and accessories. We have everything you need to build or maintain your marine sanitation system. Holding tanks are used to hold wastewater and wash water. Our durable marine holding tanks are easy to install on boats, yachts or other marine vessels. They are designed to withstand the rigors of sea travel.

Explore everything from Dometic’s basic holding tanks to Trionic options. We also sell tank monitors, vent filters, sanitation hoses, relief valves, hose adaptors, tank monitor replacement probes, and vent filter replacement cartridges. Check out the full marine water and waste holding tanks and accessories below.

Showing 19–35 of 35 resultsSorted by popularity

Sale!
Dometic / Sealand 90° 1.5″ X 1.5″ MPT Elbow 385311251
Original price was: $79.99.Current price is: $50.00.
Dometic / Sealand 90° 1.5″ X 1.5″ MPT Elbow for marine sanitation systems.

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Sale!
Dometic / Sealand HTS Basic Holding Tank
Price range: $660.00 through $925.00
Dometic HTS Basic Holding Tank. Available in multiple sizes.

Select options This product has multiple variants. The options may be chosen on the product page
Sale!
Dometic / Sealand Holding Tank Monitor DTM 04
Price range: $490.00 through $535.00
Keep tabs on your holding tank with the Dometic/SeaLand DTM04 Tank Monitor. Four LED panels show empty, low, mid, and full levels, plus a power indicator and optional full-tank shutdown to prevent overflow. Formerly the SeaLand Tank Watch; a conversion bezel is available.

Select options This product has multiple variants. The options may be chosen on the product page
Dometic Toilet Bowl and Seal Cleaner 24oz 9620023858
$19.99
The new toilet bowl cleaner by Dometic is formulated specifically for marine needs and is safe to use on any marine toilet. Its powerful cleaning formula will make the head sparkle without harming sensitive seals or downstream tank components. Additionally, it’s compatible with Dometic Max Control Natural holding tank treatment. Stop using toilet bowl cleaners not meant for holding tank systems. This is the formula you need to keep your head clean, without the risk of harming system components.

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Trionic Premium Holding Tank System (14-55 Gallon)
Price range: $370.00 through $605.00
These tanks are special orders with a 1-4 Week lead time. They are NON-RETURNABLE

Select options This product has multiple variants. The options may be chosen on the product page
Sale!
Dometic / Sealand 3″ FPT Holding Tank Adapter / Clean Out
Price range: $62.00 through $72.00
Dometic 3″ FPT Holding Tank Adapter / Clean Out. Available with or without cap.

Select options This product has multiple variants. The options may be chosen on the product page
Sale!
Dometic VacuFlush Status Panel DVS01/DVS02
Price range: $157.00 through $270.00
Dometic VacuFlush Status Panel DVS01/DVS02 available in a number of configurations and voltage options.

Select options This product has multiple variants. The options may be chosen on the product page
Dometic / Sealand Shutdown Relay for DTM
$37.99
Shutdown Relay for DTM available in 12 Volt or 24 Volt, for use with DTM04 holding tanks and DTMF04 freshwater tanks.

Select options This product has multiple variants. The options may be chosen on the product page
Sale!
Replacement Key for Dometic / Sealand Tank Manager and Discharge Controller
Original price was: $22.99.Current price is: $18.00.
Dometic key for Tank Master 4, Tank Manager & DTD panels.

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Premium Holding tank Fitting Kit
$185.00
Ideal for turning a blank polyethylene tank into a complete marine waste holding tank, this top‑mount fitting kit includes a pump‑out tube, UFA fittings with uni‑seals, vacuum relief valve, 4″ inspection plate (does not support Dometic tank monitor), vent filter assembly, and hose fittings.

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Holding Tank System with Vacuum Generator (HTSVG)
Price range: $2,202.92 through $6,180.99
These Dometic holding tanks are combined with a vacuum generator and are offered partially pre-assembled to simplify installation. The system can be ordered in 12 or 24 volt. We offer a large range of capacity options to ensure you can get the ideal tank size for your boat.

Select options This product has multiple variants. The options may be chosen on the product page
Trionic Blank Holding Tanks (4-35 Gallon)
Price range: $161.00 through $380.00
These tanks are special orders with a 1-4 Week lead time. They are NON-RETURNABLE

Select options This product has multiple variants. The options may be chosen on the product page
Trionic Blank Holding Tanks (51-150 Gallon)
Price range: $512.00 through $972.00
These tanks are special orders with a 1-4 Week lead time. They are NON-RETURNABLE

Select options This product has multiple variants. The options may be chosen on the product page
Trionic Blank Holding Tanks (36-50 Gallon)
Price range: $390.00 through $512.00
These tanks are special orders with a 1-4 Week lead time. They are NON-RETURNABLE

Select options This product has multiple variants. The options may be chosen on the product page
Key for Tank Panels 201/301
$30.00
This is an after market replacement key for Dometic’s Tank Level Panels. The panels include 201, 202, 301, and 302 panels. Related panel part numbers: 385311280 385311493 385311494 385311282 385311495 385311496

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Dometic / Sealand Inline Check Valve Small or Large
Price range: $85.99 through $263.99
Both inline check valves are designed to be used with a 1.5″ sanitation hose. The variable choice of 1.5″ or 2″ is based on the size of the duckbill valve.

Out of stock. Join the waitlist to be notified when this product becomes available.
This product has multiple variants. The options may be chosen on the product page
W-Series Wall Holding Tanks
Price range: $533.99 through $1,871.99
***This is a pre-order. Stock expected to ship starting early November.***

Dometic Wall Tank Series (W-Series) for marine waste holding tank applications. These tanks are corrosion-proof, odor free and built with high-strength ABS for long-lasting durability. Furthermore, W-Series tanks feature clever design features like internal ribs from strenthening and an optimized internal vacuum reservoir geometry for efficiency.

We have 3 options available: A basic tank, a wall holding tank system, and finally, a complete VacuMax system that includes your choice of a 12 Volt or 24 Volt Vacuum generator.

Select options This product has multiple variants. The options may be chosen on the product page