This tank showes an imput hole in the top. How big is it I couldn't find anything in the discription?

The top is a mold mark in the tank. In order to fill the tank you will need to use a hole saw bit and drill a hole into the tank where needed for your unit. Then place a plastic grommet to snug the pipe in, we also sell the grommets in 3" and 1 1/2". Thank you, Class A Customs Elkhart, Indiana

What's the deal with the hose clamp on the outlet pipe

The hose clamp is used for holding the outlet pipe in place in addition to adhesive.

Can this be used as an additional storing tank for waste? I still have the one on my camper but I want to add this one due to not having a septic yet.

I don't see why not..? It's up to you how you use it. But I replaced my tank and works great!

what is the width of the bottom part of the tank? where can I find more details dimensions before ordering it?

Please be sure to view the CAD drawing on this tank, you will need to scroll through the photos to view it.

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40 Gallon RV Waste Black Water Holding Tank WT-4000

40 Gallon RV Waste Black Water Holding Tank WT-4000

Product ID: 110463112

Details

Brand
classAcustoms
Capacity
40 Gallons
Color
Black
Material
Polyethylene
Product Dimensions
56.5"L x x 9"H

🔩3” ABS Female Outlet

🛠️40 Gallon Capacity

🇺🇸Made in USA MDPE Resin

€ 1485.65

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚐 Own the road, not the mess — upgrade your RV waste system today!

PRO GRADE OUTLET DESIGN - 3” ABS female pipe outlet ensures secure, reliable waste flow with proper piping.
MASSIVE 40 GALLON CAPACITY - Perfectly sized for extended RV adventures without frequent dumps.
PREMIUM USA MADE DURABILITY - Crafted from tough Medium Density Polyethylene for long-lasting, leak-resistant performance.
SEAMLESS ONE PIECE CONSTRUCTION - No weak points or seams to burst under pressure—built to endure.
CUSTOMIZABLE VENT INLET PLACEMENT - Tailor your installation for optimal airflow and tank performance.

The 40 Gallon RV Waste Black Water Holding Tank WT-4000 by Class A Customs is a robust, seamless, one-piece tank made in the USA from Medium Density Polyethylene resin. Designed exclusively for waste and gray water use, it features a fixed 3” ABS female outlet and requires user-installed vent and inlet fittings. Ideal for RVs, campers, trailers, and tiny houses, this tank offers durable, leak-resistant performance for hassle-free waste management on the go.

Specifications

ASIN	B07NLLQDC1
Best Sellers Rank	#482,202 in Automotive ( See Top 100 in Automotive ) #55 in RV Black Water Tanks
Brand	classAcustoms
Customer Reviews	4.4 4.4 out of 5 stars (202)
Date First Available	February 11, 2019
Item Weight	0.01 ounces
Manufacturer	Class A Customs
Manufacturer Part Number	WT-4000
Model	WT-4000

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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2 weeks ago

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€ 1485.65

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Greece.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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