---
product_id: 220612227
title: "Class A Customs | Under Mount 30 Gallon RV Concession Fresh and Gray Water Holding Tank | UM-3000"
brand: "classacustoms"
price: "AR$724402"
currency: ARS
in_stock: true
reviews_count: 8
category: "Class Acustoms"
url: https://www.desertcart.com.ar/products/220612227-class-a-customs-under-mount-30-gallon-rv-concession-fresh
store_origin: AR
region: Argentina
---

# 30 Gallon Capacity 48" x 20.5" x 8.5" Compact Dimensions NSF Certified MDPE Resin Class A Customs | Under Mount 30 Gallon RV Concession Fresh and Gray Water Holding Tank | UM-3000

**Brand:** classacustoms
**Price:** AR$724402
**Availability:** ✅ In Stock

## Summary

> 🚐 Stay hydrated on the go with confidence — your RV’s freshest upgrade!

## Quick Answers

- **What is this?** Class A Customs | Under Mount 30 Gallon RV Concession Fresh and Gray Water Holding Tank | UM-3000 by classacustoms
- **How much does it cost?** AR$724402 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/220612227-class-a-customs-under-mount-30-gallon-rv-concession-fresh)

## Best For

- classacustoms enthusiasts

## Why This Product

- Trusted classacustoms brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Versatile 30 Gallon Capacity:** Perfectly sized for fresh or gray water storage in RVs, campers, and concession trailers.
- • **Flexible Mounting Orientation:** Rotate and mount the tank on any side to fit your unique space constraints.
- • **Seamless One-Piece Construction:** Durable, leak-resistant design with no seams to burst under normal use.
- • **NSF Certified & Fresh Water Safe:** Crafted from NSF/ANSI Std 61 approved materials ensuring safe drinking water storage.
- • **Made in the USA with Quality Assurance:** Manufactured and cleaned in Elkhart, Indiana, guaranteeing premium build and reliability.

## Overview

The Class A Customs UM-3000 is a 30-gallon, NSF-certified fresh and gray water holding tank made from durable medium density polyethylene resin. Its seamless, one-piece construction prevents leaks, while flexible mounting options and vented design ensure safe, versatile use in RVs, campers, and concession trailers. Proudly made in the USA, this tank combines quality craftsmanship with practical dimensions (48" x 20.5" x 8.5") to optimize your mobile water storage needs.

## Description

FRESH/DRINKING WATER SAFE – MADE IN THE USA by Class A Customs using NSF Certified Materials Tank & fittings made from DOW NSF International NSF/ANSI Std 61 approved Medium Density Polyethylene (MDPE) Resin SEAMLESS One-piece construction, no seams to burst COLOR Creamy White you can see waterline through tank. OEM PART No retail box - no install instructions Have a certified technician install all parts to prevent product damage and personal injury PREPARATION Tanks are made in a warehouse clean each tank prior to use to remove any debris, scuffs or marking from the manufacturing process. TANK MUST BE VENTED allowing air in and out when in use. *DO NOT PRESSURIZE TANK* do not make a sealed connection from garden hose directly to tank damage will occur. DO NOT over-tighten fittings damage will occur. MOUNTING & BRACING Place tank on level surface and brace to prevent tank from moving during transit. DO NOT hang tank by straps. DO NOT place weight on tank. FOOD VENDORS - BEFORE PURCHASING - Verify all requirements with health department where inspection will be made.

Review: Fit almost perfectly - I am using this 30 gal tank on my home converted car hauler to make it a toy hauler camper. Water pump and water heater and now I can wash up. I wish I could have used a larger capacity, but I am maxing out the trailer. Good build, but definitely has a lot of debris inside. Easy enough to rinse out. Their photo diagrams help to set it up properly. So far so good
Review: Great tank - This tank was exactly what we needed. Seems to be great quality and all of the connecting points were properly sized for US sized pipe threads. Nice thick plastic. And easy to cut out sealed orifices as needed.

## Features

- 30 Gallon Fresh or Gray Water Holding Tank Manufactured by Class A Customs - Made from NSF Approved Materials - Fresh & Drinking Water Safe - Can be used for Fresh or Gray Water Storage
- WATER TANK MEASUREMENTS: 48” Longest Length (not including fittings) x 8.5” x 20.5” - Tank can sit on any side - rotate tank to change height or width Average Thickness 7/32” +/- Please view photos. (Due to the manufacturing process +/- .25" on each measurement)
- TANK BUILT-IN FITTINGS: (TWO) 1.5" Female NPT Fitting - fitting is sealed and water-tight, to use remove membrane with razor knife (TWO) .5" Female NPT Fitting - fitting is open DO NOT Over-tighten fitting damage will occur – Use plastic threaded fittings, metal threads may damage tank fittings
- NON-PRESSURIZED TANK: tank must be vented allowing air in and out during use. DO NOT make a sealed connection with a garden hose directly to tank, this is a pressurized connection and will cause tank to explode causing damage. For filling tank it is recommended to use a fill dish or other gravity process.
- Great extra water storage in RV, pop-up camper, off-road vehicles, concession trailers, hot dog carts, smaller food vendors and portable hand washing sinks. Class A Customs Manufactures this item in the USA in Elkhart, Indiana. Tanks are made in a warehouse clean each tank prior to use to remove any debris, scuffs or marking from the manufacturing process.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Best Sellers Rank | #437,763 in Automotive ( See Top 100 in Automotive ) #134 in RV Freshwater Tanks & Inlets |
| Brand | classAcustoms |
| Capacity | 30 Gallons |
| Color | White |
| Customer Reviews | 4.4 out of 5 stars 115 Reviews |
| Item Weight | 18 Pounds |
| Material | Polyethylene (PE), Resin |
| Product Dimensions | 48"L x 20.5"W x 8.5"H |

## Product Details

- **Brand:** classAcustoms
- **Color:** White
- **Material:** Resin, Polyethylene (PE)
- **Product Dimensions:** 48"L x 20.5"W x 8.5"H
- **Capacity:** 30 Gallons

## Images

![Class A Customs | Under Mount 30 Gallon RV Concession Fresh and Gray Water Holding Tank | UM-3000 - Image 1](https://m.media-amazon.com/images/I/61HKnoayXsS.jpg)
![Class A Customs | Under Mount 30 Gallon RV Concession Fresh and Gray Water Holding Tank | UM-3000 - Image 2](https://m.media-amazon.com/images/I/61LHQUpxWAL.jpg)
![Class A Customs | Under Mount 30 Gallon RV Concession Fresh and Gray Water Holding Tank | UM-3000 - Image 3](https://m.media-amazon.com/images/I/711kAiR0H9L.jpg)
![Class A Customs | Under Mount 30 Gallon RV Concession Fresh and Gray Water Holding Tank | UM-3000 - Image 4](https://m.media-amazon.com/images/I/71Urviu0AoS.jpg)
![Class A Customs | Under Mount 30 Gallon RV Concession Fresh and Gray Water Holding Tank | UM-3000 - Image 5](https://m.media-amazon.com/images/I/71kc5yphBXS.jpg)

## Questions & Answers

**Q: Would this tank be strong enough to use in the bed of a pickup truck for mobile car detailing without warping or breaking?**
A: Yes it would be strong enough but definitely too small.  It’s not made for mobile car wash.  You need a much much bigger tank

**Q: if vented can a garden hose be fitted to it?**
A: All water tanks we carry must be vented, they are not pressurized tanks.
You must allow air to move in and out when filling and emptying the tank. Do NOT fill the tank directly from a pressurized line (garden hose), this is not a safe option and will explode the tank. We recommend using a fill dish to allow for gravity feeding of the tank, please review our plumbing example for more information.

The fill dish is located on the outside of your unit so that you can easily add water to your tank without the need of opening a compartment or climbing under your unit. You can find the fill dishes in the Plumbing Category.
*For adding water to the Water Tank you need a Gravity Fill Dish, the hose rests in the port it does not screw onto the port this allows you to place a garden hose into the Gravity Fill Dish port without making a sealed connection so the supply is not pressurized.
*For using water directly from a garden hose you need a City Fill Dish, the hose makes a sealed connection and the water supply is pressurized, you can not hook this to your water tank and you do not need to go through your water pump.

*But what if I only turn the garden hose on half way?
Customers who do this still explode the tank because you can not determine the pressure of the water flowing only the amount of water.

*I am not using a fill dish how can I fill the tank?
We recommend you place a fitting in the tank that will allow you to rest the hose in to fill, not make a sealed connection, you can then cap this when not in use. You can use an elbow fitting to allow you the fill the tank to capacity, use an elbow with a screen secured over it to vent the tank.

*Can I put a cap on and off of the tank?
If you are needing to use a fitting by adding and removing a cap, remember tank must be vented allowing air in/out during use, we recommend you place a fitting in the tank and a cap on that fitting in order to prevent damage to the tank fitting.

**Q: What is the highest temperature water this tank can support?**
A: NSF Testing on Tank Material - Domestic hot - The temperature used during testing is 60 +/- 2°C (140 +/- 4 °F) and appears in Listings as "D. Hot". This is intended to apply to product applications where the product is used for either cold (ambient temperatures) or hot water up to domestic hot temperatures.

**Q: What is the recommended mounting materials such as brackets/angle iron and where should they be positioned on the tank for mounting under a van frame?**
A: Tanks can be installed inside or outside of unit, for food vendors verify requirements before purchasing as some areas do not allow tanks to be outside of the unit and others do not allow the tank to be inside of the unit.
Be sure to Sanitize Tank before installing.

All tanks must be braced and secured to prevent any movement of the tank while in transit and to prevent possibility of tank tipping or falling.
Due to the manufacturing process all the tanks especially the larger in size will have a bowing to the walls, when the tank is filled the tank will expand out removing the inward bow, we recommend laying all tanks on a level surface (this can be angled to help with drainage) and bracing the tanks. For larger tanks it is recommended to brace all side walls with plywood or metal, we do not recommend using ratchet straps on the tanks alone as this is a large amount of weight on a thin strip and may cause cutting into the tank. For tanks placed outside it is also recommend to enclose tanks using sheet metal / plywood or some other type of weather proof material to prevent damage from road debris and speed bumps, be sure to check your clearance before ordering.

Brackets or Strap Systems Due to the variety of installations we do not carry brackets or bracing systems

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fit almost perfectly
*by D***R on October 22, 2024*

I am using this 30 gal tank on my home converted car hauler to make it a toy hauler camper. Water pump and water heater and now I can wash up. I wish I could have used a larger capacity, but I am maxing out the trailer. Good build, but definitely has a lot of debris inside. Easy enough to rinse out. Their photo diagrams help to set it up properly. So far so good

### ⭐⭐⭐⭐⭐ Great tank
*by A***R on July 19, 2024*

This tank was exactly what we needed. Seems to be great quality and all of the connecting points were properly sized for US sized pipe threads. Nice thick plastic. And easy to cut out sealed orifices as needed.

### ⭐⭐⭐⭐⭐ Quick ship
*by P***. on April 28, 2023*

Looks great and shipped very quickly. Arrived 2 days early. Very happy with the purchase.

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*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-01-31*