What is the inside diameter?

Its about 1.75". I measured it with a ruler. It is not 2".

This might be an odd question...but would this work to secure a 1.0 inch drain hose for a washer?

I doubt this would secure the outlet if you are trying to use it to prevent it from popping out under pressure. The diameter of the base is just under 2". It is loose if you use a 2" hole saw. If your outlet house is the standard inverted "u" and hold into a PVC pipe then I would just use a zip tie around the two pipes.

Are they rubber or plastic? How flexible are they?

They are plastic but fairly flexible.

Is this grommet available in 1.5” size?

Didnt see any. This was the smallest I found. Found others larger.

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HYCC 2 Inch Desk Grommet Black, Desk Hole Cover for Cables, Flexible Cable Grommet - 5 Pack

HYCC 2 Inch Desk Grommet Black, Desk Hole Cover for Cables, Flexible Cable Grommet - 5 Pack

Product ID: 108887430

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Details

Brand
HYCC
Color
Black
Material
Acrylonitrile
Style
Modern
Product Dimensions
2.4"L x 2.4"W

📏Fits 2-inch desk holes

🔌Organizes cables up to 1.5 inches

🛠️Durable ABS material

Description

🔌 Elevate your workspace—ditch the cable chaos in style!

EFFORTLESS SETUP - Simply insert after drilling—no tools or hassle required
PEACE OF MIND WARRANTY - 1-year coverage with hassle-free replacement, no returns needed
PERFECT FIT EVERY TIME - Designed for 2-inch holes with a 2.4-inch outer diameter for seamless installation
SLEEK CABLE MANAGEMENT - Transforms cluttered desks into clean, professional workspaces
DURABILITY MEETS DESIGN - Crafted from corrosion-resistant ABS for long-lasting use

The HYCC 2 Inch Desk Grommet Black is a 5-pack of durable ABS cable covers designed to fit 2-inch desk holes and organize cables up to 1.5 inches in diameter. Easy to install and corrosion-resistant, these grommets provide a sleek, professional look while offering a 1-year warranty with hassle-free replacement service.