The best RV toilet holding tank depends on the space available, required capacity, drain position, and fitting layout. The RecPro 16.5-by-19-by-8-inch tank is a compact option, while RecPro’s 29- and 50-gallon models offer larger listed capacities. The ICON 437 includes toilet-mounting reinforcements and several fittings. A swivel rinser is included as a related maintenance accessory, not as a replacement tank.
| Product | Best For | Key Listed Detail |
|---|---|---|
| RecPro 29-Gallon Tank | Installations needing a left drain | 60 x 24 x 7 inches |
| RecPro 16.5 x 19 x 8 Tank | Compact replacement spaces | Fittings kit not included |
| Swivel Stik Rinser | Tank rinsing and upkeep | Stainless steel handle |
| RecPro 50-Gallon Tank | Higher-capacity storage | 53 x 27 x 10.5 inches |
| ICON 437 Tank | Toilet mounting and included fittings | Bottom drain |
RecPro 29-Gallon Left-Drain Holding Tank
This tank is best for an RV installation that needs a listed 29-gallon capacity and a left-side drain. Its dimensions are 60 by 24 by 7 inches, which gives buyers concrete measurements to compare against the existing tank bay.
Choose this model if the drain orientation and long, shallow dimensions suit the vehicle. Avoid choosing by capacity alone: confirm available clearance and drain location before ordering. The supplied listing details do not specify fittings, so verify what connections the installation requires.
RecPro Compact 16.5 x 19 x 8 Tank
This RecPro black water tank is best for buyers working with a smaller installation footprint. Its listed dimensions are 16.5 by 19 by 8 inches. The product name identifies it as a black water tank, making it relevant to toilet waste storage.
The key limitation is explicit: a fittings kit is not included. Choose it if you can source the correct fittings separately and the measurements suit your layout. Confirm connection positions and fitting requirements before purchase, since those details are not provided here.
Swivel Stik Holding Tank Rinser
This item is a tank-cleaning accessory, not a holding tank. It is best for an RV owner looking for a rinser with a swivel design and stainless steel handle as part of tank maintenance.
Choose it as an accessory rather than a storage replacement. The provided product details do not specify dimensions, connection type, or which tank openings it fits, so verify the instructions and setup requirements before relying on it.
RecPro 50-Gallon Holding Tank
This RecPro tank is best for buyers prioritizing the largest stated capacity among the listed tank options. It holds 50 gallons and measures 53 by 27 by 10.5 inches, so it requires a comparatively substantial installation space.
The product name states that fittings are not included. Choose it if the vehicle has room for its dimensions and you can obtain the appropriate fittings separately. Avoid assuming that a larger capacity will fit an existing tank bay without measuring first.
ICON 437 Bottom-Drain Holding Tank
The ICON 437 is best for buyers who need a bottom-drain design and value listed toilet-mounting reinforcements. It measures 22.5 by 18.5 by 6 inches. Its listed included fittings are a 3-inch threaded fitting, a 2-inch slip fitting, and a 3-inch ID/7-inch OD flange fitting.
The listing says no additional fittings are needed, but buyers should still confirm that the included connection types and tank dimensions match their RV. The smaller listed size may not provide the capacity needed for every travel pattern.
Buying Guide: Choosing an RV Toilet Holding Tank
How do you choose the right tank size?
Start with the replacement tank’s physical dimensions and required capacity. A tank’s gallon rating does not tell you whether it will fit beneath the floor or inside an existing compartment. Measure the available length, width, and height, and compare those measurements with the product listing. Consider capacity after confirming the space works.
Why do drain position and fittings matter?
Drain orientation affects how the tank connects to the RV’s waste plumbing. A left drain, bottom drain, or differently positioned outlet may not suit an existing installation. Check the old tank’s outlet location and the fittings needed for the toilet and discharge plumbing. Product listings that say fittings are not included require additional planning.
Is a holding tank the same as a rinser?
No. A holding tank stores wastewater, while a rinser is an accessory intended for tank cleaning. A rinser cannot replace a tank. If you are shopping for a replacement, compare tank dimensions, capacity, drain location, and connections first; consider cleaning accessories separately.
What should you check before ordering?
- Measure the installation area and compare it with the tank’s listed dimensions.
- Confirm whether the listed capacity suits your expected use.
- Match the drain orientation and connection types to the RV plumbing.
- Check whether fittings are included or must be sourced separately.
- Confirm that a product is a tank rather than a maintenance accessory.
Frequently Asked Questions
What is an RV toilet holding tank?
It is a wastewater storage tank connected to an RV toilet. Check the product listing to distinguish a black water tank from a cleaning accessory.
Which listed tank has the largest capacity?
The RecPro 50-gallon model has the largest stated capacity among these products.
Which option lists toilet-mounting reinforcements?
The ICON 437 listing specifies built-in reinforcements for mounting a toilet.
Do these tanks include fittings?
Fitting details vary. The RecPro 16.5-by-19-by-8-inch tank is listed without a fittings kit, the RecPro 50-gallon tank says no fittings, and the ICON 437 lists included fittings.
Can I select a tank by gallon capacity alone?
No. Verify dimensions, drain position, and connection requirements as well as capacity before choosing a replacement.