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

$1802.68

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Description

🚐 Keep your RV fresh on the road with the ultimate black water tank upgrade!

LIGHTWEIGHT YET ROBUST - Easy to handle during installation but built to withstand the rigors of the road.
MASSIVE 40 GALLON CAPACITY - Perfectly sized to keep your RV running longer without frequent dumps.
PREMIUM USA MADE MDPE RESIN - Durable, seamless one-piece construction built to resist cracks and leaks.
PRECISION 3 ABS FEMALE OUTLET - Engineered for secure, reliable waste discharge—just add your piping and dump valve.
CUSTOMIZABLE INLET VENT PLACEMENT - Tailor your installation for optimal venting and performance—hardware not included.

The 40 Gallon RV Waste Black Water Holding Tank WT-4000 by Class A Customs is a rugged, seamless, medium density polyethylene tank designed exclusively for waste and gray water use in RVs, campers, trailers, and tiny houses. Made in the USA, it features a fixed 3” ABS female outlet and requires user-installed inlet and vent fittings. Engineered for durability and ease of customization, this tank ensures reliable waste management on the go.

Specifications

ASIN	B07NLLQDC1
Best Sellers Rank	#476,641 in Automotive ( See Top 100 in Automotive ) #48 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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$1802.68

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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