Free shipping on your order of RV & Marine Parts of $100 or more.

Does not apply to toilets, tanks or battery boxes.


$75 Flat Rate Shipping on all Foot Pedal Toilets!

Call (800) 253-0115 for freight quote on all other toilets. 

Holding Tank Systems


These holding tanks provide long-lasting performance and efficiency. They are constructed from a high-strength polyethylene with a heavy-duty wall thick enough to maintain integrity under high pressure and to avoid leaks. They are pre-plumbed with inlet and discharge fittings, a vent fitting, an inspection port and a pressure relief valve. Already pressure tested, just plug in and go.

Free shipping does not apply to holding tanks, toilets or battery boxes.

Ardemco offers a variety of RV and marine holding tanks. 

A holding tank is absolutely essential for any boat or motorhome with toilet access. We offer complete holding tank systems that are highly durable, effective and easily installed.

Our holding tank systems are constructed from heavy duty polyethylene, and are pre-assembled with all of the necessary fillings and ports - installation is a snap even if you have no familiarity with portable septic systems. Tanks range in size from 11 gallons to 100 gallons, so you can find a system to accommodate individuals, small groups or even large families.

In addition to our complete holding tank systems, we also offer essential parts and accessories like pump-out adapters and tank monitors. Best of all, we offer discount prices on all of our products.

Browse our full inventory of marine and rv holding tanks and tank accessories. Be sure to read the specifications carefully before buying.

We sell only the highest quality products.  Be aware that not all parts are designated for all systems. If you need any assistance with installation, or if you need help choosing the right holding tank system for your boat or RV, drop us an email at, or give us a call at 1-800-253-0115. We are available from 8AM until 4:30PM Monday through Friday.  We will gladly answer any of your questions to help ensure that you select the right protect for your needs.

Don't settle for inferior marine products at unfair prices. Shop now and take advantage of our great deals on superior systems.

View as: