Butler Creek Flip-Open Eyepiece Cover, Black Polymer, Size 03 (1.39"/35.30mm) - Model 20035

The Butler Creek Flip-Open Eyepiece Cover Model 20035 is a custom-fit protection solution designed for scope eyepieces measuring 1.39" (35.30mm) in diameter. Whether you're glassing from a treestand, hunting in wet conditions, or shooting at the range, this polymer cover keeps dust, moisture, and debris off your optic glass until the moment you need to aim—then flips open silently so you can focus on your shot, not your gear.

This eyepiece cover works through a simple friction-mount system that grips your scope's barrel without tools or permanent installation. The spring-hinged design opens with a light thumb pressure, and because those hinges are specifically engineered to operate silently, you won't hear a snap or click that might alert game. When closed, an air-tight semi-O-ring seal blocks out dust and moisture, protecting your lens surfaces between trips and during storage. The entire assembly weighs less than an ounce, so there's no measurable penalty to your setup weight.

Built from black polymer and tested to operate in extreme cold down to -40°F, this cover is truly ambidextrous—it works equally well for right- or left-handed shooters. Butler Creek also makes versions for spotting scopes if you need matching protection across your glassing kit.

Key Features

• Fast flip-open design keeps you ready to shoot without removing the cover completely
• Silent spring hinges—no noise to spook game or distract during competitions
• Water-tight custom-fit friction mount secures the cover with zero tools required
• Air-tight semi-O-ring seal prevents dust and moisture ingress
• Rated to -40°F for use in harsh weather and extreme cold
• Ambidextrous operation for any shooter or glassing position
• Weighs less than one ounce—negligible impact on scope balance or handling

Specifications

Frequently Asked Questions

What scope eyepiece sizes does this cover fit?

The Model 20035 Size 03 is designed for eyepieces with a 1.39" (35.30mm) diameter. Butler Creek offers multiple sizes, so if your scope's eyepiece is larger or smaller, check the size rating on your scope's manual or contact us to confirm the correct fit for your optic.

How does the friction mount work without damaging my scope?

The friction mount grips your scope's barrel through gentle pressure—no screws, no adhesive, no permanent marks. The polymer is designed to hold securely during normal use while releasing easily when you need to remove or adjust the cover.

Will this cover work in rain or snow?

Yes. The water-tight seal created by the custom fit and semi-O-ring keeps moisture and snow out. The cover is tested and rated for extreme cold conditions down to -40°F, making it reliable in rain, snow, and freezing temperatures.

Can I use this cover on a left-handed setup?

Yes. The Butler Creek Flip-Open Eyepiece Cover is truly ambidextrous and works equally well for right- or left-handed shooters and spotters.