Fresh Gray Water Holding Tank Combo - RV & Camper - BPA Free

In this review of the Fresh Gray Water Holding Tank Combo, the bottom line is simple: this pair of rotationally molded tanks is aimed at RV, camper and trailer owners who need reliable, seamless storage for both fresh and gray water. The reviewer found the combination of a 16 gallon and a 21 gallon tank attractive for installations where space is limited but multiple capacities are required, and the single biggest reason to buy is the tanks' one piece, seam-free polyethylene construction that reduces the risk of leaks and blow-outs in mobile applications.

Key Features

• Seamless construction: One piece rotational molding removes joints and seams, reducing the chance of burst or leakage over time in a moving vehicle.
• Durable polyethylene: High quality, stain and corrosion resistant material holds up to RV and marine environments without rusting or degrading quickly.
• Port configuration: Each tank includes one 1.25 in water fill inlet and three 3/8 in NPT connections so common hook-ups are quickly accessible.
• Two sizes included: The combo provides a 16 gallon and a 21 gallon tank to suit mixed-capacity installs where both fresh and gray water containment is required.
• BPA free: Materials are BPA free, making the fresh water tank appropriate for potable water use when installed and vented correctly.

Who It's For

This product is best for RV owners, concession trailer operators, food truck owners and horse trailer users who need replaceable or OEM-style freshwater and gray water tanks that fit within constrained compartments. Anyone who values a robust, non-metallic tank that resists staining and corrosion will appreciate this combo.

Those who should look elsewhere include users who require pressurized tanks or integrated sensors and fittings beyond the included ports, or installations that demand nonstandard connection sizes; the tanks are non-pressurized and must be vented as part of proper installation.

Pros & Cons

Pros

• Seamless, one piece construction minimizes leak risk compared with multi-piece tanks.
• BPA free polyethylene offers resistance to stain, corrosion and rust and is suitable for potable water storage.
• The combo of 16 and 21 gallon sizes provides flexibility for mixed fresh and gray water setups in tight spaces.
• Multiple factory ports, including a 1.25 in fill inlet and three 3/8 in NPT connections, simplify common hookups.

Cons

• Non-pressurized design requires proper venting and may not suit systems that expect pressurized tanks.
• Fittings beyond the supplied ports may be required to match specific vehicle plumbing, so measuring before purchase is essential.

Specifications

Our Verdict

The Fresh Gray Water Holding Tank Combo is a practical, value-oriented choice for RV and trailer owners who need durable, leak-resistant freshwater and gray water storage in a compact footprint. Its seamless polyethylene build, BPA free material and useful port selection make it a dependable replacement or OEM option when venting requirements and connection sizes are confirmed before purchase.

Frequently Asked Questions

Do these tanks require venting?
Yes. These are non-pressurized tanks and must be vented as part of proper installation.

Are the tanks safe for drinking water?
Yes. The tanks are BPA free and intended for fresh water when installed correctly with appropriate fittings and venting.

What fittings are included?
Each tank comes with one 1.25 in water fill inlet and three 3/8 in NPT connections; additional adapters may be needed for specific plumbing.