My sewer drain opening width is 3.75 inches. Will this fit? The measurements say its 3.92 inches wide and idk know how flexible the rubber seal is?

My floor drain opening(Cast Iron)is the same size as yours(3.75" inside Diameter). I too had the same question/concern. Well I had a sewer backup and while my plumber was there rodding out my sewer main line I asked him about this. He took the valve and pounded it down into place and told me "tight is right". He then screwed it in til the screws were all snugged up. He told me you want these to be a tight fit. I said okee dokee. I again had a backup later on and this valve saved my basement from flooding. I am so glad I bought this and let my plumber install it. I will buy another one and put it on the shelf in case I ever need to install another one.

Will the rubber components hold up to the furnace condensate, which contains acid, and is currently being discharged to my floor drain?

The rubber will probably be fine, just add some silicone grease. The issue I always have when I use a device like this on my furnace drain, is the metal components rusting or the brass corroding. The condensate is a PH between 2.9 to 4.

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Minimprover Internal Backwater Valve,4-F 4" Float Model Flood-Guard for 3-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection

Minimprover Internal Backwater Valve,4-F 4" Float Model Flood-Guard for 3-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection

Product ID: 376263352

Details

Material
Brass Rubber
Brand
Minimprover
Exterior finish
Brass
Inlet connection type
Flange
Outlet connection type
Flange

💧3-inch float model

🔧Durable brass construction

🛠️Easy installation

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VT21326

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌊 Stay dry, stay smart with Flood-Guard!

COMPACT DESIGN - Fits seamlessly into your existing 3-inch flood drains without hassle.
CORROSION RESISTANT - Crafted from solid brass for long-lasting durability and performance.
PROTECT YOUR PROPERTY - Prevent costly flood damage with this reliable backwater valve.
SMART FLOOD PREVENTION - Automatically seals off drains during sewer backups, keeping your space safe.
EFFORTLESS INSTALLATION - Set it up in minutes with just a screwdriver—no plumbing expertise required!

The Minimprover Internal Backwater Valve is a robust 3-inch float model designed to prevent sewer backflow and protect your property from flooding. Made from durable brass and featuring easy installation, this essential device ensures peace of mind during heavy rains or sewer overloads.

Specifications

Manufacturer	Minimprover
Part number	H087-3
Item Weight	209 g
Package Dimensions	8.2 x 8.2 x 8 cm; 209 g
Item model number	H087-3
Size	3" Flood-Guard
Material	Brass Rubber
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

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