Fresh and Gray Water Holding Tank Combo Pack - RV Combo

In this review the Fresh and Gray Water Holding Tank Combo Pack is assessed for RV and trailer owners who need durable, leak-resistant storage. The bottom line: this combo is best for users needing a matched fresh and gray setup with multiple ports and seamless construction, because the tanks are rotationally molded from durable polyethylene and include essential fittings for typical RV installations. The reviewer found the set practical for replacement or OEM fitment, and the non-pressurized design and vent requirement are straightforward for standard plumbing layouts.

Key Features

• Two-size combo: Includes both a 30 gallon and a 42 gallon tank so installers get fresh and gray capacity suitable for many small to mid-size RVs and trailers.
• Durable construction: Rotational molded polyethylene and one-piece seamless design reduce risk of blow-outs, stains, corrosion, or rust compared with multi-piece tanks.
• Standard connections: Each tank ships with one 1.25 in water fill inlet and three 3/8 in NPT connections to simplify common hookups and fittings.
• Non-pressurized design: Tanks are vented rather than pressurized, which matches typical RV freshwater and gray water plumbing and eases installation of vents and fittings.
• BPA free: Fresh water storage is made with BPA-free material, offering reassurance for potable water in mobile kitchens and campers.

Who It's For

The combo pack is ideal for RV owners, camper builders, concession trailers, and food trucks that need both fresh and gray water capacity with reliable, seamless tanks; contractors replacing OEM tanks will appreciate the range of ports and standard inlet sizes. The included 30 gal and 42 gal sizes cover common installation spaces where matching fresh and gray capacities matters.

Those who should look elsewhere include users who require pressurized tanks or integrated sensors and pumps; this set is non-pressurized and intended to be vented, so buyers needing pump-ready or pressurized systems should consider tanks specifically designed for that purpose.

Pros & Cons

Pros

• Seamless, rotational molded construction lowers risk of leaks and extends service life in mobile environments.
• Includes a 30 gal and a 42 gal tank to serve both fresh and gray systems without separate orders.
• Standardized ports and a 1.25 in fill inlet simplify hookup to typical RV plumbing fixtures.

Cons

• Non-pressurized design requires a vent and separate pump if pressurization is desired, which adds components and installation time.

Specifications

Fresh tank capacity	30 gallon
Fresh tank dimensions	34 in x 18 in x 12 in (not including fittings)
Gray tank capacity	42 gallon
Gray tank dimensions	39 in x 18 in x 14 in (not including fittings)
Inlets and ports	One 1.25 in fill inlet and three 3/8 in NPT connections per tank
Material	Rotational molded polyethylene, BPA free
Construction	One-piece seamless, non-pressurized (vent required)

Our Verdict

The combo pack delivers practical, heavy-duty freshwater and gray water storage for RVs and trailers, offering good value for installers who need seamless tanks with standard ports and BPA-free material. It is especially well suited for replacement or OEM installations where non-pressurized vented tanks are acceptable; buyers needing pressurized or sensor-integrated solutions should compare other options.

Frequently Asked Questions

Are these tanks ready to hook up to RV plumbing?
Yes, they include one 1.25 in fill inlet and three 3/8 in NPT connections per tank to match common plumbing fittings, though a vent and any pumps are installed separately.

Do the tanks come with sensors or pumps?
No, the tanks are non-pressurized and shipped without pumps or level sensors; those components must be added if required.

Is the material safe for potable water?
Yes, the tanks are made from BPA-free rotationally molded polyethylene suitable for fresh water storage.