Think this would work for 3inch rv waste tank drain valve connected with 3inch pvc pipe?

Yes, however I would personally go with a bulkhead adapter in that case. Only because these fittings over time will inevitably crack.

On the 3 inch Uniseal, what is the outer diameter of the outer flange?

The outside diameter to the 3" Uniseal is 5".

How would this work connecting an inground rubber pond liner to a 275 gal tote also in ground using either a pipe or directly side by side?

This would work for the Tote but will not work for the liner.

So I would drill a 4in hole in order to accommodate the uniseall?

Yes. You need to drill a 4" hole. I had to use some soapy water to get the uniseal to seat into the 4" hole.

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3" UNISEAL Flexible Tank Adapter Made in the USA (Bulkhead) - 5 Pack

3" UNISEAL Flexible Tank Adapter Made in the USA (Bulkhead) - 5 Pack

Product ID: 45678160

Details

Brand
Green Goods
Color
Black
Connector Type
Adapter
Item Weight
0.3 kg
Manufacturer
The Uniseal
Material
Plastic Rubber

🔧Compatible with 3/8” tanks

⏱️Installs in minutes

🇺🇸Made in the USA

€ 59.35

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Description

🚀 Upgrade Your Tank Game with Ease!

BULK SAVINGS - Five-pack ensures you’re always prepared.
USER FRIENDLY - Comes with detailed instructions for hassle-free setup.
DURABLE DESIGN - Crafted from high-quality plastic and rubber.
QUICK INSTALLATION - Get your tanks ready in no time!
VERSATILE COMPATIBILITY - Perfect for tanks with up to 3/8” wall thickness.

The 3" UNISEAL Flexible Tank Adapter (Bulkhead) - 5 Pack is a high-quality, USA-made solution designed for quick and easy installation. Compatible with tanks featuring a wall thickness of up to 3/8”, this durable adapter is crafted from premium plastic and rubber, ensuring long-lasting performance. Each pack includes five adapters, making it a smart choice for those who value efficiency and reliability.

Specifications

ASIN	B07218BRW2
Best Sellers Rank	#361,770 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #265 in Compression Bulkhead Fittings
Brand Name	Green Goods
Color	Black
Connector Type	Adapter
Customer Reviews	4.4 4.4 out of 5 stars (95)
Item Weight	0.3 kg
Manufacturer	The Uniseal Warehouse
Manufacturer Part Number	U300
Material Type	Plastic, Rubber
Model Number	U300
Number of Pieces	5
Set Name	3 Inch Uniseal Flexible Tank Adapter Bulkhead Fitting Set (5 Pack)
Size	3 Inch
Thread Size	3 inch
Thread Type	NPT
UPC	637262982661
Unit Count	1 Count

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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How is product pricing calculated?+

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

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Excellent communication throughout the order process. Product is perfect.

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€ 59.35

Duties & taxes included

In stock

Sold byAmazon GERMANYDelivered 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 GERMANY.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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The product quality is outstanding. Exactly what I needed for my work.

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