Fresh and Gray Water Holding Tank Combo Pack - Durable RV Tanks

In this review of the Fresh and Gray Water Holding Tank Combo Pack the bottom line is simple: this pair of rotationally molded polyethylene tanks is for RV and trailer owners who need reliable, seam-free storage for both potable and gray water. The reviewer found the combination of a 10 gallon and a 16 gallon tank particularly useful for tight installations, and the single-piece construction and BPA free material are the single biggest reasons to buy if longevity and leak resistance are priorities.

Key Features

• One-piece seamless construction: The tanks are molded without seams so there is less risk of blow-outs or leaks over time, which is critical in mobile installations.
• Durable polyethylene material: Rotational molding with high quality polyethylene provides resistance to stains, corrosion and rust compared with metal alternatives.
• Two-size combo: The pack includes a 10 gallon and a 16 gallon tank to give flexible capacity options for smaller RVs, trailers or concession units.
• Multiple access ports: Each tank comes with one 1.25 in water fill inlet and three 3/8 in NPT connections for easier hookups and customized plumbing layouts.
• BPA free: The fresh water tank is safe for potable water use and suitable for food truck or concession trailer service when clean water storage is required.
• Non-pressurized design: The tanks are built as non-pressurized containers and must be vented, which keeps plumbing simple but requires attention to venting when installed.

Who It's For

The combo pack is well suited to RV owners, small motorhome and trailer converters, and operators of concession trailers or food trucks who need both fresh and gray water containers in modest capacities. Someone with limited under-bench or compartment space will appreciate the 17 in x 14 in x 10 in 10 gallon tank and the 24 in x 15 in x 10 in 16 gallon tank dimensions that are easy to fit into common cavities.

Those who should look elsewhere include users who require pressurized water systems or much larger capacity tanks; this pack is not intended as a high-volume or pressurized solution. Also, installers who cannot provide proper venting as required for non-pressurized tanks should consider a different style.

Pros & Cons

Pros

• Seamless rotationally molded construction reduces the chance of leaks and blow-outs compared with multi-piece tanks.
• BPA free material makes the fresh water tank suitable for potable use in RVs, trailers, and food service vehicles.
• Multiple inlet and NPT connections simplify custom plumbing and hookup during installation.
• Resistant to stains, corrosion and rust, making the tanks low maintenance over time.

Cons

• Non-pressurized design means the tanks must be vented and are not suitable for systems that require pressurization.
• Capacity is modest; users needing very large freshwater reserves will need additional or larger tanks.

Specifications

Package contents	One 10 gallon tank and one 16 gallon tank
10 gallon tank dimensions	17 in x 14 in x 10 in (excluding fittings)
16 gallon tank dimensions	24 in x 15 in x 10 in (excluding fittings)
Material	Rotational molded polyethylene, BPA free
Connections	One 1.25 in water fill inlet and three 3/8 in NPT connections per tank
Construction	One-piece seamless design (non-pressurized)
Resistance	Stain, corrosion and rust resistant

Our Verdict

The Fresh and Gray Water Holding Tank Combo Pack is a practical, value-oriented choice for RV owners and trailer operators who need reliable, low-maintenance freshwater and gray water storage without complex plumbing. Its seamless polyethylene build and multiple ports make installation straightforward for properly vented systems, and the paired 10 gal and 16 gal sizes fit many compact spaces while offering durable, BPA free water storage.

Frequently Asked Questions

Do these tanks need to be vented?
Yes. The tanks are non-pressurized and must be vented when installed to function correctly.

Are the tanks safe for drinking water?
Yes. The tanks are BPA free and suitable for potable fresh water storage.

What fittings are included?
Each tank comes with a 1.25 in water fill inlet and three 3/8 in NPT connections for hook-ups.