---
product_id: 25695135
title: "classAcustoms | T-4000 | One (1) RV Fresh Water 40 Gallon Tank, Grey Water"
brand: "classacustoms"
price: "R9574"
currency: ZAR
in_stock: true
reviews_count: 8
category: "Class Acustoms"
url: https://www.desertcart.co.za/products/25695135-classacustoms-t-4000-one-1-rv-fresh-water-40-gallon
store_origin: ZA
region: South Africa
---

# 40 Gallon Capacity Compact 39.5" x 18" x 13" Dimensions NSF Certified MDPE Resin classAcustoms | T-4000 | One (1) RV Fresh Water 40 Gallon Tank, Grey Water

**Brand:** classacustoms
**Price:** R9574
**Availability:** ✅ In Stock

## Summary

> 💧 Stay hydrated on the go with the ultimate RV water tank upgrade!

## Quick Answers

- **What is this?** classAcustoms | T-4000 | One (1) RV Fresh Water 40 Gallon Tank, Grey Water by classacustoms
- **How much does it cost?** R9574 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/25695135-classacustoms-t-4000-one-1-rv-fresh-water-40-gallon)

## 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 Installation:** Rotate tank to fit your space perfectly—mount on any side with built-in fittings all on one panel.
- • **Proudly Made in the USA:** Precision manufactured in Elkhart, Indiana, ensuring quality and reliability you can trust.
- • **Massive 40-Gallon Capacity:** Store ample fresh or gray water for extended trips without compromise.
- • **Seamless One-Piece Construction:** Durable, leak-resistant design eliminates weak points and bulging under pressure.
- • **NSF Certified & Drinking Water Safe:** Crafted from premium NSF/ANSI Std 61 approved materials for pure, safe water storage.

## Overview

The classAcustoms T-4000 is a 40-gallon fresh or gray water holding tank made from NSF-certified medium density polyethylene resin. Its seamless, one-piece construction ensures durability and leak resistance, while the compact 39.5" x 18" x 13" design allows versatile mounting options. Designed for safe drinking water storage, it features multiple built-in fittings on one side for easy installation. Manufactured in the USA, this tank is ideal for RVs, campers, and mobile vendors seeking reliable, high-capacity water storage.

## 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: Can't find a better deal - Amazing fresh water tanks for my school bus conversion. No leaks, no bulging. All the npt holes on a single side of the tank is perfect compared to some other over engineered RV tanks. Excellent price for these. I got two 40gal for a total of 80gal of fresh water.
Review: 40 Gal. Would buy again. - I got the 40 gal version. No leaks. It didn't have a unreasonable amount of distortion when full. I did have a little trouble getting brass 1/2" PEX fittings to thread in without cross threading. I was using Teflon tape and that seemed to be causing the issue. Eventually I figured out that leaving the first thread of the brass exposed, so the brass engaged the threads with no Teflon and then the Teflon started, they would thread in with no issue.

## Features

- 40 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: 39 1/2” Longest Length (not including fittings) x 13” x 18” - 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 watertight, 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 connecting fittings as metal will damage threads.
- 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 |
|---------------|-------|
| ASIN | B01B898H9C |
| Best Sellers Rank | #189,992 in Automotive ( See Top 100 in Automotive ) #72 in RV Freshwater Tanks & Inlets |
| Brand | classAcustoms |
| Capacity | 40 Gallons |
| Color | White |
| Customer Reviews | 4.4 4.4 out of 5 stars (160) |
| Date First Available | December 21, 2019 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 49 pounds |
| Item model number | T-4000 |
| Manufacturer | Class A Customs |
| Manufacturer Part Number | 40-gal |
| Material | Polyethylene (PE), Resin |
| Model | T-4000 |
| Product Dimensions | 39.5"L x 18"W x 13"H |
| Shape | Rectangular |
| UPC | 808890308967 |

## Product Details

- **Brand:** classAcustoms
- **Capacity:** 40 Gallons
- **Color:** White
- **Material:** Polyethylene (PE), Resin
- **Product Dimensions:** 39.5"L x 18"W x 13"H

## Images

![classAcustoms | T-4000 | One (1) RV Fresh Water 40 Gallon Tank, Grey Water - Image 1](https://m.media-amazon.com/images/I/51IooSZAFNL.jpg)

## Questions & Answers

**Q: How thick is the plastic that the tank is made of?**
A: Average thickness 7/32” +/-

**Q: Can i stand this up so that the 39.5 inches is the height? If so, is the tank strong enough to withstand over the road travel or will i need to suppor**
A: The tank is strong enough, but all the plumbing holes would be on top of the tank. Why not buy a tank that's designed to be upright like the High Country 1/4 round or 1/2 round vertical tank. Something like this one. https://www.amazon.com/High-Country-Plastics-SL-39-gallon/dp/B0042L749S/ref=pd_sbs_86_3/143-1446200-0535447?_encoding=UTF8&pd_rd_i=B0042L749S&pd_rd_r=714f569d-d145-4695-bdcf-ab4025c53550&pd_rd_w=uEw4N&pd_rd_wg=kF6i5&pf_rd_p=52b7592c-2dc9-4ac6-84d4-4bda6360045e&pf_rd_r=W2Z3ACWY9QYJ9KQY4RC7&psc=1&refRID=W2Z3ACWY9QYJ9KQY4RC7

**Q: Does it have fittings on both ends?**
A: No, fittings are on one side, please look at the photos and description. Thanks

**Q: Is it 50lbs empty?**
A: No it's not hevey at all

## Customer Reviews

### ⭐⭐⭐⭐⭐ Can't find a better deal
*by K***K on November 9, 2025*

Amazing fresh water tanks for my school bus conversion. No leaks, no bulging. All the npt holes on a single side of the tank is perfect compared to some other over engineered RV tanks. Excellent price for these. I got two 40gal for a total of 80gal of fresh water.

### ⭐⭐⭐⭐⭐ 40 Gal. Would buy again.
*by J***N on December 1, 2021*

I got the 40 gal version. No leaks. It didn't have a unreasonable amount of distortion when full. I did have a little trouble getting brass 1/2" PEX fittings to thread in without cross threading. I was using Teflon tape and that seemed to be causing the issue. Eventually I figured out that leaving the first thread of the brass exposed, so the brass engaged the threads with no Teflon and then the Teflon started, they would thread in with no issue.

### ⭐⭐⭐⭐ Have water
*by N***H on November 21, 2025*

Does the job

## Frequently Bought Together

- Class A Customs | T-4000 | One (1) RV Fresh Water 40 Gallon Tank, Grey Water
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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-10*