When outfitting an RV, selecting a reliable 25 gallon water tank supports longer trips with fewer refills and better water management. The following 5 products from Class A Customs and related offerings cover fresh, gray, and waste water needs, with NSF-approved materials and varied mounting options. Each option is suitable for RVs, campers, and tiny homes, offering built-in fittings and durable construction for long-term use.
| Product | Capacity | Water Type | Mounting | Notes |
|---|---|---|---|---|
| T-2500 One (1) 25 Gallon Tank | 25 gal | Fresh/Gray | Standalone | NSF approved; two 1.5″ NPT fittings; open 0.5″ NPT fittings |
| RV Fresh And Gray Water Tank Combo Pack (20G & 25G) | 20 & 25 gal | Fresh/Gray | Standalone | NSF certified MDPE; two 0.5″ NPT and two 1.5″ NPT fittings per tank |
| Under Mount 25 Gallon RV Concession Tank UM-2500 | 25 gal | Fresh/Gray | Under-mount | Rotatable orientation; built-in fittings |
| Under Mount 25 Gallon RV Concession Tank UM-2500 | 25 gal | Fresh/Gray | Under-mount | Similar to UM-2500; different listing |
| T-2500-SP Spouted 25 Gallon Tank | 25 gal | Fresh/Gray | Spouted | Spout fitting; multiple NPT fittings |
T-2500 One (1) 25 Gallon RV Tank
This 25 gallon freshwater or gray water holding tank is manufactured by Class A Customs using NSF approved materials. It is suitable for fresh or drinking water storage and is designed to sit on any side by rotating height or width. Measurements are approximately 33.5 inches in length with a thickness around 7/32 inch. The tank includes two 1.5 inch female NPT fittings and two 0.5 inch female NPT fittings, all sealed with membranes that should be removed before use. Fittings should be connected with plastic adapters to avoid thread damage.
RV Fresh And Gray Water Tank Combo Pack (20G & 25G)
This combo pack includes 20 gallon and 25 gallon tanks manufactured with NSF-certified MDPE resin and UV-stabilized with 8 UV. Each tank features two 1/2 inch and two 1 1/2 inch female NPT fittings. The fittings are initially closed and can be opened by removing a membrane. The materials and construction are designed for RV fresh or gray water storage and are suitable for use with standard fittings. The kit provides a cost-effective way to expand or complement an RV’s water storage capacity.
Under Mount 25 Gallon RV Concession Tank UM-2500
Designed for under-mount installation, this 25 gallon tank is suitable for fresh or gray water in RVs. It features NSF-approved materials and a rotatable design to adjust orientation. Dimensions around 24 inches in length, with a width of 8.5 inches and height of 13 inches. Built-in fittings include two 1.5 inch NPT fittings and two 0.5 inch NPT fittings. As with Class A Customs products, the tank is compatible with common fittings but care should be taken to avoid over-tightening to protect threads.
Under Mount 25 Gallon RV Concession Tank UM-2500 (Alternate Listing)
This listing mirrors the under-mount 25 gallon configuration designed for fresh or gray water storage. It emphasizes the rotatable design to adapt to space constraints, and includes two 1.5 inch and two 0.5 inch NPT fittings with a similar warning about avoiding over-tightening. It is constructed from NSF-approved materials and is compatible with standard RV plumbing components.
T-2500-SP Spouted 25 Gallon Tank
The T-2500-SP offers a spouted design for easier dispensing or filling, while maintaining 25 gallon capacity for fresh or gray water. It includes a combination of fittings: one 1.25 inch outer diameter by 2 inch long spout, plus three 0.5 inch NPT fittings that are open. The spout fitting requires a hose with clamp, and the design emphasizes compatibility with standard RV plumbing, providing a flexible setup for various RV layouts.
WT-2525 3″ Black Water RV Waste Tank 25 Gallon
This 25 gallon waste holding tank is designed specifically for black/gray water applications rather than fresh water. Made in the USA from MDPE resin, it emphasizes waste/gray water use only and comes with an 3 inch ABS outlet that is fixed and not movable. The user is responsible for installing appropriate inlet and vent fittings, and ensuring proper venting to avoid pressure buildup. Do not pressurize the tank, and avoid overtightening fittings to protect threads.
Buying Guide
- Water type compatibility: Choose tanks explicitly labeled for fresh water, gray water, or black water (waste). Mixing water types in a single tank can cause contamination and odor issues.
- Material and safety: Look for NSF or NSF/ANSI Std 61 certification and MDPE resin for durability and safety in potable water storage. UV stabilization helps long-term outdoor use.
- Fittings and compatibility: Confirm the number and size of built-in fittings (commonly 1.5″ NPT and 0.5″ NPT). Ensure fittings align with your RV plumbing and connectors; replace metal fittings if corrosion is a concern.
- Mounting options: Decide between standalone tanks, under-mount, or spouted configurations. Under-mount designs save space but require precise installation; spouted tanks can simplify dispensing.
- Dimensions and orientation: Check length, width, and height to ensure the tank fits the available space. Some tanks allow rotation to adapt to cabinet or compartment layouts.
- Maintenance and care: Plan for membrane removal for fittings, cleaning, and regular inspection for leaks. Use plastic adapters to prevent thread damage.
- Replacement and compatibility: If replacing an existing tank, verify that the new tank matches inlet/outlet locations and overall footprint to minimize re-plumbing.
- Budget and bundles: Combo packs can offer savings if you require multiple tanks. Verify material certifications and warranty terms from the seller.