InSinkErator Deep Sink 3.5 Extended Sink Flange - Fits Thick Sinks

In this review of the InSinkErator Deep Sink 3.5 Extended Sink Flange the bottom line is simple: this is a practical replacement flange for homeowners with thicker sink materials who need a reliable, genuine part that fits without modification. The reviewer found it particularly useful for solid surface, cast iron, and thicker stainless sinks where standard flanges fall short. Its polished stainless finish keeps the sink opening looking neat while the extended design accommodates sinks from 3/4 in up to 1-3/4 in thick, which is the single biggest reason to choose this flange.

Key Features

• Extended fit: Designed to connect InSinkErator disposers to sinks 3/4 in up to 1-3/4 in thick, avoiding the need for improvised adapters.
• Polished stainless finish: Provides a clean, corrosion-resistant appearance that complements most sink finishes and resists staining.
• Genuine replacement: A factory-made InSinkErator part that installs to the original mounting system for reliable compatibility.
• Made to fit: Manufactured to the brand's standards so it aligns with InSinkErator disposer mounts and simplifies installation.
• Durability: Stainless steel construction gives long-term resistance to wear in the sink opening where water and food contact is constant.

Who It's For

This flange is best for homeowners, handypersons, and plumbers working with thicker sink materials such as solid surface, large-gauge stainless, porcelain, or cast iron where the standard flange length is insufficient. It is an especially good choice when replacing or reinstalling an InSinkErator disposer that requires a deeper flange to reach the mounting assembly.

Those with very thin sinks or who use non-InSinkErator mounting systems may not need this extended flange; likewise, if a sink requires alternate parts for installation (noted for some thicker installations), a professional inspection is recommended before purchase.

Pros & Cons

Pros

• Genuine InSinkErator part ensures proper fit with the brand's disposers and mounting assembly.
• Extended length supports sinks up to 1-3/4 in thick, preventing installation headaches on thicker counters.
• Polished stainless steel finish looks clean and resists corrosion over time.
• Simple replacement option that avoids custom work or makeshift adapters.

Cons

• Specific to InSinkErator disposers and mounts, so it may not fit other brands without adapters.
• Installations on very unusual sink assemblies may still require alternate parts as noted by the manufacturer.

Specifications

Product	Deep Sink Flange, Polished Stainless Steel
Brand	InSinkErator
Fitment	Sinks 3/4 in up to 1-3/4 in thick
Finish	Polished stainless steel
Compatible With	All InSinkErator disposers
Model	FLG-SSLG

Our Verdict

The InSinkErator Deep Sink 3.5 Extended Sink Flange is a straightforward, good-value replacement for installations involving thicker sinks. It does exactly what it promises: provides the extra length and a polished finish while maintaining compatibility with InSinkErator mounts, making it the sensible choice for homeowners and technicians who need a dependable, factory-fit flange.

Frequently Asked Questions

Will this flange fit non-InSinkErator disposers?
It is designed for use with InSinkErator disposers and mounts; other brands may require adapters or different flanges.

What sink thickness does it support?
The extended flange supports sinks from 3/4 in up to 1-3/4 in thick.

Is the finish resistant to corrosion?
Yes, the polished stainless steel finish is corrosion-resistant and intended for long-term sink exposure.