Best Grey Waste Water Tank Solutions for RVs and Campers
Finding the right grey water tank for your RV, camper, or tiny house can prevent leaks, odor, and maintenance hassles. This guide profiles five reliable options that fit common RV waste systems, highlighting capacities, inlet/outlet configurations, and installation notes. Use the buying guide to compare capabilities and choose a tank that matches your setup and travel style.
| Product | Capacity | Outlet Size | Notes |
|---|---|---|---|
| classAcustoms WT-3418 | 34 Gallon | 1.5″ outlet | MDPE; vent requirement; not for drinking water |
| classAcustoms WT-1653 | 16 Gallon | 3″ outlet | MDPE; vent required; not for drinking water |
| classAcustoms WT-3232 | 32 Gallon | 1.5″ outlet | MDPE; vent required; not for drinking water |
| classAcustoms WT-3161 | 31 Gallon | 3″ outlet | MDPE; vent required; not for drinking water |
| classAcustoms WT-3445 | 34 Gallon | 1.5″ outlet | MDPE; vent required; not for drinking water |
Class A Customs WT-3418 34-Gallon Grey Water Tank
The WT-3418 is a 34-gallon grey water holding tank manufactured in the USA by Class A Customs using MDPE resin. It is designed specifically for waste/gray water and is not intended for fresh or drinking water. The tank features a 1.5-inch ABS outlet; installation typically places the inlet and vent on the user side, and hardware is not included. A caution highlights not to pressurize the tank and to avoid over-tightening fittings to prevent damage.
Class A Customs WT-1653 16-Gallon Black Water Tank
The WT-1653 provides a 16-gallon capacity with a 3-inch outlet, suitable for black water applications in RVs and campers. It is produced in the USA from MDPE resin and is intended for waste water only. As with other Class A Customs tanks, the end user determines inlet/vent locations, and hardware is not included. The design emphasizes venting and cautions against pressurizing the tank or overtightening fittings.
Class A Customs WT-3232 32-Gallon Grey Water Tank
This 32-gallon grey water tank from Class A Customs uses MDPE resin and features a 1.5-inch outlet. It’s designed for waste/gray water use only and requires venting. The installer must place inlet and vent as needed, and hardware is not included. It is built for durability and compliance with typical RV plumbing configurations while warning users not to pressurize the tank.
Class A Customs WT-3161 31-Gallon Hub Black Water Tank
The WT-3161 is a 31-gallon black water tank with a 3-inch outlet, produced in the USA from MDPE resin. It is intended for waste/gray water and requires venting. The end-user must decide inlet/vent placement, and hardware is not included. As with other models, the tank should not be pressurized and fittings should not be over-tightened to avoid damage.
Class A Customs WT-3445 34-Gallon Grey Water Tank
The WT-3445 is a 34-gallon grey water tank made in the USA with MDPE resin and a 1.5-inch discharge hub. It is designed for grey/gray water use and requires venting. The installation approach mirrors other Class A Customs tanks, with inlet/vent placement determined by the end user and hardware not included. Avoid pressurizing the tank and ensure fittings are snug but not overtightened.
Buying Guide: Key Purchase Considerations
When selecting a grey water tank, consider capacity needs based on travel frequency and the number of occupants. A larger tank (24–34 gallons) reduces the need for frequent dumping on longer trips but may require more space and heavier handling. Outlet size matters for compatibility with existing plumbing; many units use 1.5″ or 3″ outlets, and some require separate valve assemblies or piping (not included). Ensure the tank is vented to prevent pressure buildup and odors, and verify that it is constructed from durable MDPE resin for longevity in outdoor conditions. Always confirm that the tank is intended strictly for grey water and not drinking water. If hardware is not included, plan for compatible fittings and sealants to achieve a leak-free installation. Finally, review installation instructions to decide whether inlet and vent placements align with your RV configuration or if professional mounting is advisable.
Other considerations include compatibility with your dump hoses and dump valves, ease of cleaning, weight when full, and whether the tank’s geometry best fits under your chassis. For campers with limited space, a 16–32 gallon model may offer a balance between capacity and maneuverability. In scenarios requiring multiple compartments or a dedicated black water tank, ensure you choose configurations that support proper venting and separation of waste streams. Assess warranty and manufacturer guidance on pressure limits and maintenance to protect your investment over years of use.
In summary, the five highlighted options cover a range of capacities and outlet configurations to match common RV and camper plumbing layouts. By prioritizing venting, correct outlet sizing, and durable MDPE construction, you can minimize maintenance and optimize waste management on every trip.