Choosing the right gray water tank for your RV ensures reliable waste storage on the road and at the campsite. This guide highlights five top options that balance capacity, material quality, and practical fittings. Each product section includes key features, usage notes, and considerations to help you compare effectively.
| Product | Brand | Capacity | Dimensions (L x W x H) |
|---|---|---|---|
| 30 Gallon RV Fresh/Gray Water Tank | A.A | 30 Gallon | 34″ x 18″ x 12″ |
| Class A Customs Combo Pack (40 & 46) | classAcustoms | 40 & 46 Gallon | Not specified |
| RV Fresh & Gray Water Tank Combo (30 & 40) | classAcustoms | 30 & 40 Gallon | Not specified |
| 42 Gallon RV Fresh/Gray Water Tank | A.A | 42 Gallon | 39″ x 18″ x 14″ |
| 16 Gallon RV Fresh/Gray Water Tank | A.A | 16 Gallon | 24″ x 15″ x 10″ |
30 Gallon RV Fresh/Gray Water Tank (A.A)
This non-pressurized, rotational molded tank measures 34″ x 18″ x 12″ (excluding fittings) and is designed for RV gray water storage. It includes a 1.25″ water fill inlet and three 3/8″ NPT connections. The one-piece seamless construction reduces the risk of leaks or bursts, and the tank must be vented during use. Suitable for RV setups needing a moderate capacity solution with durable construction.
Class A Customs Combo Pack (40 & 46 Gallon)
This combo pack includes two NSF-certified tanks: 40 gallon and 46 gallon. Made with MDPE resin and UV stabilization, both tanks come with built-in fittings (two 1.5″ balloon style threaded NPT female fittings and two 0.5″ NPT fittings). The set emphasizes durability, compatibility with RV plumbing, and suitability for fresh or gray water storage. Note the need to follow venting recommendations to avoid pressure buildup in non-pressurized configurations.
RV Fresh and Gray Water Tank Combo (30 & 40 Gallon)
This combo pair from Class A Customs offers a 30 gallon and a 40 gallon tank, both NSF-approved and suitable for fresh or gray water. The tanks are non-pressurized and vented; fittings include two 1.5″ and two 0.5″ NPT mounts. The design focuses on safe handling and gravity filling, with guidance to avoid direct, sealed connections to hose water sources. This option targets RV users who want two sizes for versatile configurations.
16 Gallon RV Fresh/Gray Water Tank (A.A)
This compact 16 gallon tank measures 24″ x 15″ x 10″ and is made from durable polyethylene with one-piece seamless construction to prevent bursting. Ideal for smaller RVs or auxiliary storage needs, its lighter capacity makes it easier to handle while still providing non-pressurized storage with venting requirements for safe operation.
Buying Guide
- Capacity and space: Select a tank that matches your typical gray water volume and RV layout. Larger tanks reduce the frequency of dumping but require more storage space and mounting options.
- Material and durability: Rotationally molded polyethylene tends to be durable and UV-resistant. NSF certification is a plus for safety and compatibility with drinking-water standards when used for fresh water storage.
- Ventilation and pressure: Non-pressurized tanks require venting. Avoid sealed connections to prevent pressure buildup and potential tank damage.
- Fittings and compatibility: Check inlet/outlet sizes and fittings included. Ensure compatibility with your current hoses, valves, and valve placement in your RV system.
- Installation considerations: Consider mounting hardware, weight distribution, and easy access for maintenance. Heavier tanks may need reinforced brackets or additional support.
- Maintenance needs: Some products include odor-control and cleaning benefits; plan for routine flushing, deodorizing, and odor management to keep systems running smoothly.
- Budget and availability: While price isn’t listed here, compare total cost against capacity, material quality, and warranty when evaluating options.
- Multi-pack options: Combo packs offer size variety and may simplify inventory for RVs that require different configurations at different times.