---
product_id: 171746348
title: "Class A Customs 31 Gallon RV Waste Black Water Holding Tank WT-3100"
brand: "classacustoms"
price: "€ 435.59"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.nl/products/171746348-class-a-customs-31-gallon-rv-waste-black-water-holding
store_origin: NL
region: Netherlands
---

# 3” ABS Fixed Outlet 31 Gallon Capacity Made in USA MDPE Resin Class A Customs 31 Gallon RV Waste Black Water Holding Tank WT-3100

**Brand:** classacustoms
**Price:** € 435.59
**Availability:** ✅ In Stock

## Summary

> ♻️ Upgrade your RV’s waste system with confidence and style!

## Quick Answers

- **What is this?** Class A Customs 31 Gallon RV Waste Black Water Holding Tank WT-3100 by classacustoms
- **How much does it cost?** € 435.59 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/171746348-class-a-customs-31-gallon-rv-waste-black-water-holding)

## 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

- • **Generous 31 Gallon Capacity:** Perfectly sized for extended RV adventures without frequent dumps.
- • **Premium USA-Made MDPE Resin:** Durable, seamless one-piece construction ensures no leaks or bursts.
- • **Fixed 3” ABS Female Outlet:** Engineered for secure waste discharge—just add your piping and dump valve.
- • **Lightweight Yet Robust Design:** Easy to mount and brace, built to withstand the rigors of the road.
- • **Customizable Inlet & Vent Placement:** Tailor installation to your RV setup for optimal venting and performance.

## Overview

The Class A Customs 31 Gallon RV Waste Black Water Holding Tank WT-3100 is a rugged, seamless polyethylene tank designed exclusively for waste and gray water storage in RVs, campers, trailers, and tiny houses. Made in the USA with MDPE resin, it features a fixed 3” ABS female outlet and requires user-installed inlet and vent fittings. Its durable construction and customizable installation make it a reliable choice for professional-grade waste management on the go.

## Description

RV Waste Water Holding Tank MADE IN THE USA by Class A Customs using Medium Density Polyethylene (MDPE) Resin TANK NOT FOR FRESH OR DRINKING WATER USE – WASTE/GRAY WATER USE ONLY -SEAMLESS One-piece construction, no seams to burst COLOR Black 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 INSTALLED OUTLET 3” ABS Female Pipe - outlet can not be moved DO NOT over-tighten fittings damage will occur Dump valves do not hook directly to the 3" ABS fitting, from the outlet run PVC or ABS piping, dump valve is added to the piping. INLET & VENT INSTALLATION Class A Customs Black Water Tanks only come with the outlet the end user will determine where the inlet and vent will need to be placed and install, hardware NOT included. TANK MUST BE VENTED allowing air in and out when in use. *DO NOT PRESSURIZE TANK* DO NOT over-tighten fittings damage will occur. MOUNTING & BRACING be sure to secure tank to prevent movement and be sure to secure due to weight when loaded DO NOT place weight on tank.

## Features

- 31 Gallon RV Waste Water Holding Tank MADE IN THE USA by Class A Customs using Medium Density Polyethylene (MDPE) Resin TANK NOT FOR FRESH OR DRINKING WATER USE – WASTE/GRAY WATER USE ONLY – Used in RV’s Campers, Trailers, Motorhomes and Tiny Houses
- INSTALLED OUTLET 3” ABS Female Pipe - outlet can not be moved DO NOT over-tighten fittings damage will occur Dump valves do not hook directly to the 3" ABS fitting, from the outlet run PVC or ABS piping (not included), dump valve (not included) is added to the piping.
- INLET & VENT INSTALLATION Class A Customs Black Water Tanks only come with the outlet the end user will determine where the inlet and vent will need to be placed and install, hardware NOT included. TANK MUST BE VENTED allowing air in and out when in use. *DO NOT PRESSURIZE TANK* DO NOT over-tighten fittings damage will occur.
- NOT INCLUDED Inlet and Vent Fittings / Additional Fittings / Hardware / Mounting Hardware / Dump Valve / Piping NOT INCLUDED

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | classAcustoms |
| Color | Black |
| Material | Polyethylene (PE), Polyvinyl Chloride (PVC), Resin |
| Product Dimensions | 47.5"L x 21.75"W x 8"H |
| Capacity | 31 Gallons |
| Shape | Rectangular |
| Manufacturer | Class A Customs |
| Manufacturer Part Number | WT-3100 |

## Product Details

- **Brand:** classAcustoms
- **Color:** Black
- **Material:** Polyethylene (PE), Polyvinyl Chloride (PVC), Resin
- **Product Dimensions:** 47.5"L x 21.75"W x 8"H
- **Capacity:** 31 Gallons

## Images

![Class A Customs 31 Gallon RV Waste Black Water Holding Tank WT-3100 - Image 1](https://m.media-amazon.com/images/I/61PfuamppvL.jpg)

## Questions & Answers

**Q: There are two different lengths shown in the listing, one says 47.50" and another says 57.50". Which is it?**
A: Tank is 47.5" long. The outlet pipe adds another 4.25"

**Q: Does anyone know where I can get a cap for the end of the pipe? Its outside diameter is 3-7/8". I want to seal it off completely.**
A: Any hardware store. Lowes, Home Depot, Ace, etc.

**Q: Is it FDA approved?**
A: This is a discharge tank.

**Q: Instructions say dont use straps, can you mount it just by the flange and is that strong enough to support it?**
A: This same style tank is mounted under a forest river R-Pod camper at my local dealer. It has z-channel brackets that span between frame rails holding up the shoulders of the tank. I called the dealer and they are able to order the brackets from the manufacturer for $38 each. I had my father in law weld me two that match before the dealer got back to me. Still working on painting and mounting them.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great tank
*by F***K on December 24, 2023*

Great tank for replacement of any black tank in a trailer. Was not exactly as the same that I removed but fit great and has standard size. Madewell and a sturdy.

### ⭐⭐⭐⭐⭐ Good tank at a reasonable price.
*by H***A on August 9, 2022*

I got two of these tank made by the same company here in the USA, a 31 and a 40 gallon capacity. Both came in in a cardboard box with no damage to the tank since they are light weight.The outside of the tank is opaqued black finish while the inside is a sleek and shiny smooth finish which I like for keeping the fluids and solids from sticking to the walls and it makes it easier to power flush using the tornado 360-degree RV holding tank Rinser.They came with only the discharge port fitting ( 3”) installed at the lowest point of the tank and the rest of the plumbing fitting like vent line, toilet discharge, tank rinser .. has to be poked and installed by the installer based on your layout requirements.This is not a rigid tank and I don’t think that anyone wants that in this type of application since the need to be able to flex and absorb the road vibration in order to stay in one piece with out cracking.I do believe this is a good tank that will serve the purpose of what it’s intended for with great results.

### ⭐⭐⭐⭐⭐ Perfect very strong tank
*by E***O on September 7, 2021*

Exact what I was looking for for my application, easy to install, strong tank.

## Frequently Bought Together

- Class A Customs 31 Gallon RV Waste Black Water Holding Tank WT-3100
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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-03-16*