Oatey 43538 ABS Cast Iron Flange Replacement, 4-Inch - Easy Install

In this review of the Oatey 43538 ABS Cast Iron Flange Replacement, 4-in, the bottom line is simple: this is a practical, low-cost solution for replacing a broken or corroded cast iron closet flange without tearing up the floor. Installers and DIYers will appreciate that the product was designed to work with existing cast iron piping using a rubber compression gasket and three stainless-steel bolts, so the biggest reason to buy is the ability to restore a toilet flange quickly and securely while saving time and money.

Key Features

• Compression gasket: The rubber compression gasket creates a seal that lets the flange be used on many types of cast-iron piping, reducing the need to cut into existing stacks.
• Adjustable compression joint: The joint provides up to 3 in of adjustment to the riser, making it easier to align the flange to the toilet outlet height.
• Stainless-steel bolts: Three stainless-steel bolts compress the gasket to secure the flange, improving corrosion resistance where metal contact matters.
• Durable plastic construction: The ABS body is made for long-lasting use and resists the deterioration common to old cast iron fittings.
• Tool-free installation: The flange installs easily without tools and avoids tearing up the floor, which saves both time and repair cost.
• Smooth flow design: The smooth, unrestricted flow path reduces the chance of clogs where the replacement meets the existing pipe.

Who It's For

This flange is ideal for homeowners in older houses with damaged cast iron closet flanges who want a straightforward repair that does not require replacing floor material or cutting into the stack. Plumbers and remodelers will find it useful when a quick, adjustable replacement is needed to bring a toilet back into service.

It is not aimed at installations that require a full cast iron restoration or where a specific metal-to-metal replacement is mandated by code or preference. If a completely metal flange or a non-adjustable OEM part is required, professionals should choose a different product.

Pros & Cons

Pros

• Easy to install without tools, making it accessible for competent DIYers and pros alike.
• Compression design with rubber gasket helps prevent leaks on a variety of cast iron pipe conditions.
• Three stainless-steel bolts and durable ABS construction improve longevity and functionality compared with a brittle flange.

Cons

• Some users report mixed experiences on long-term sturdiness and rust resistance in very aggressive environments.

Specifications

Product	Cast iron closet flange replacement
Model	43538
Material	ABS plastic body with rubber compression gasket
Connection	Compression joint with 3 stainless-steel bolts
Adjustment	Up to 3 in of riser adjustment
Nominal size	4-in

Our Verdict

The Oatey 43538 ABS Cast Iron Flange Replacement, 4-in is a practical, cost-effective choice for repairing broken cast iron toilet flanges without tearing up the floor. It offers reliable sealing via a rubber compression gasket and easy adjustment, making it good value for homeowners and tradespeople who want a fast, dependable repair.

Frequently Asked Questions

Will this flange fit old cast iron pipe?
Yes. The rubber compression gasket is designed to accommodate many types of cast-iron piping and create a seal without cutting the pipe.

Is special tooling required to install it?
No. The flange is intended to install easily without tools using the compression bolts to secure the gasket.

How much adjustment does the flange allow?
The compression joint provides up to 3 in of adjustment to the riser for aligning the toilet outlet height.