Introduction
Finding the right caravan grey water tank is essential for safe, reliable RV and camper operations. This guide highlights durable, NSF-approved options in a range of capacities from 10 to 125 gallons, designed for fresh or gray water storage or, in some cases, dedicated waste handling. Each product features built-in fittings and versatile orientations to fit diverse setups. Read on to compare capacities, dimensions, and mounting considerations to choose the best fit for your rig.
| Product | Brand | Capacity | Notes |
|---|---|---|---|
| UM-2000 | Class A Customs | 20 Gallon | Fresh or Gray Water, NSF approved |
| T-4000 | classAcustoms | 40 Gallon | Fresh or Gray Water, NSF approved |
| Combo Pack (30 & 42) | RecPro | 30 & 42 Gallon | Fresh/Gray water, pressure tested |
| 16 & 21 Gallon | A.A | 16 & 21 Gallon | Rotational molded, BPA free |
| T-1000 | classAcustoms | 10 Gallon | Fresh or Gray Water |
Class A Customs UM-2000 20 Gallon UnderMount Tank
The UM-2000 is a 20 gallon under-mount holding tank suitable for RV fresh or gray water. Built from NSF-approved materials, it is safe for water storage and designed to sit on any side. Key measurements are a 48” longest length, 8.5” height, and 13” width, with an average thickness of 7/32”. Included fittings consist of two 1.5″ female NPT and two 0.5″ NPT connections. This tank emphasizes watertight integrity with a sealed membrane for easy setup, and is compatible with plastic threaded fittings to avoid damage to fittings or threads.
Class A Customs T-4000 40 Gallon RV Tank
The T-4000 provides a 40 gallon capacity for fresh or gray water with NSF-approved materials. It can be oriented in multiple ways, with a longest length of 39.5” and dimensions of 13” by 18”. It features built-in fittings (two 1.5″ FPT sealed fittings and two 0.5″ FPT fittings) and notes about avoiding over-tightening to prevent damage. The tank is designed to be sat on its side and rotated to adjust height and width, ensuring flexible installation in many RV layouts.
RecPro Fresh And Gray Water Holding Tank Combo Pack
This combo pack from RecPro includes 30 and 42 gallon tanks for fresh or gray water. The lineup is NSF approved, manufactured in America, and each tank has undergone pressure testing. The dual-pack offers a versatile solution for campers needing larger capacities for weekend adventures or longer trips without frequent emptying. The pair can be used independently or together in multi-tank configurations, depending on space and plumbing layout.
A.A Fresh Gray Water Tank Duo – 16 & 21 Gallon
The Fresh Gray Water Holding Tank duo includes 16 and 21 gallon options made from rotational molded, BPA-free polyethylene. With one-piece seamless construction, these tanks reduce the risk of leaks and bursting. Dimensions are 24″ x 15″ x 10″ for the 16 gallon and 39″ x 16″ x 8″ for the 21 gallon (not including fittings). Both tanks sit on their sides and are designed to handle fresh or gray water storage with ease and reliability.
Class A Customs T-1000 10 Gallon Tank
The T-1000 is a compact 10 gallon option for fresh or gray water, with NSF-approved materials and the same portability as larger Class A Customs tanks. At 19” long, 9” wide, and 14” tall (approximate, excluding fittings), this tank is easy to install in tighter spaces. It includes two 1.5″ FPT sealed fittings and two 0.5″ FPT fittings, and it is designed to be rotated to optimize height and width for various RV configurations.
Buying Guide
- Capacity and space: Choose a tank that matches your typical travel duration and available installation space. Larger rigs may benefit from 30–125 gallon models, while smaller RVs are better suited to 10–20 gallon tanks.
- Fresh vs gray water: Confirm whether the tank is rated for fresh water, gray water, or waste (black water). Some tanks have dual-use flexibility but follow manufacturer guidance.
- Material and safety: Look for NSF approval and BPA-free rotational molding when possible to ensure water safety and durability.
- Fittings and connections: Check the fittings’ size (commonly 1.5″ NPT or 0.5″ NPT) and whether they are sealed. Ensure you have compatible plastic fittings to prevent thread damage.
- Mounting orientation: Many tanks are designed to sit on any side or be rotated to adjust height and width. Confirm the mounting options fit your RV’s layout and plumbing routing.
- Maintenance and cleaning: Consider tanks with smooth interiors and accessible fittings for easier cleaning and sanitization, especially for potable water use.
- Weight and handling: Larger tanks add weight when full. Plan for lifting, storage, and handling during installation and maintenance.
- Ventilation and venting: For proper drainage and odor control in black or gray water applications, ensure appropriate venting and valve placement during installation.
- Warranty and support: Check manufacturer warranties and availability of replacement fittings or accessaries if needed in the future.
By evaluating capacity, material safety, and installation flexibility, you can select a caravan grey water tank that aligns with your travel patterns and RV layout. The options above cover a range of sizes and configurations, enabling both simple and more complex plumbing setups while maintaining reliability on the road.