Zurn Z310 - Thoroflush Drain Select Product (see spec sheet for info):ZN310-4IP - Cast Iron Body with A.R.C. Interior and Exterior with Polished Nickel Bronze Top - 4” Pipe Size - Threaded The black hole saw is

The black hole saw is also 6” deep

Corrosion-Resistant Coating: Protects against weathering and extends product life

This pour-on gravel binder can be used in residential

corrosion-resistant ductile iron ensures lasting performance

The grate is made of ductile iron and will rust over time forming a protective iron-oxide patina that begins red-orange and ages to a deep

Zurn Z310 - Thoroflush Drain Select Product (see spec sheet for info):ZN310-4IP - Cast Iron Body with A.R.C. Interior and Exterior with Polished Nickel Bronze Top - 4” Pipe Size - Threaded The black hole saw isThe Zurn Z310 is a flushing rim floor drain engineered for environments where regular washing, sanitation, and surface clearance are essential. Ideal for commercial kitchens, laboratories, food processing areas, and any facility requiring frequent cleaning, it combines effective flush performance with reliable drainage and easy maintenance. Key Features Integrated Flush Rim: Delivers a perimeter jet of water around the base, helping sweep solids and