STI-6516 Weather Resistant Cover

About this item

The STI-6516 is Safety Technology International's Mini Bopper Stopper, a surface-mounted weather-resistant protective cover for keypad locks, keyless entry units, and electronic access control hardware installed in exterior or exposed locations. It fits over the existing hardware with a clear polycarbonate hinged flap that spring-returns to closed automatically, protecting the device from rain, ice, snow, vandalism, and accidental damage whenever it's not being actively used.

This is the accessory specified when Alarm Lock Trilogy electronic keypad locks, security keypads, alarm controls, and keyless entry units are installed in locations that see moisture, freezing temperatures, or high-traffic foot areas where equipment damage is a concern. American Locksets stocks this as an authorized Alarm Lock Trilogy accessories dealer.

What the STI-6516 Covers and Protects Against

The cover body and hinge are molded from thick, UV-stabilized clear polycarbonate. UV stabilization matters for outdoor installations because standard clear polycarbonate turns yellow and becomes brittle within a few years of sun exposure. The STI-6516 maintains clarity and impact resistance across its full service life without degradation from direct sunlight.

The hinge springs are stainless steel torsion springs, not plastic tabs. This means the cover snaps back to closed position every time it's released, which is critical in wet climates. A cover that stays open defeats the purpose — moisture enters the keypad housing during rain events and ice forms on the keypad surface in winter. The auto-close spring prevents that. The gasket that ships with the unit seals the cover edge when closed, blocking moisture infiltration from wind-driven rain and misting.

Ice and snow are the specific problem this cover addresses for standard indoor-rated keypads. Even weatherproof models like the Alarm Lock DL2700WP can have operational issues when ice forms directly on the keypad buttons. The STI-6516 cover creates an air pocket that reduces direct contact with freezing precipitation, keeping the keypad operational in conditions that would otherwise require a service call.

Certifications and Compliance

UL/cUL listed. ADA compliant. The hinged flap design allows single-hand operation, which is the ADA requirement for access hardware. The cover doesn't require two hands to lift and hold open while operating the keypad — the torsion spring holds the flap up while you use the device.

STI backs the STI-6516 with a 3-year guarantee against breakage of the polycarbonate in normal use.

Compatible Devices and Installation

The STI-6516 is sized for keypads up to approximately 3.25 inches wide and 4 inches in the covered dimension. Confirmed compatible with Alarm Lock Trilogy series locks including the DL2700, DL2700IC, DL2775IC, DL4100, and related Trilogy cylindrical and mortise keypad locks. Also fits Marks IQ Locks and can be applied over volume controls, lighting controls, and similar access hardware with matching footprint dimensions.

Installation is surface mount using the included mounting screws and gasket. No special tools or modification to the existing lock or keypad are required. The cover mounts directly above or around the existing hardware, and the clear polycarbonate allows full visibility of the keypad layout through the closed cover so users can see the buttons before lifting the flap.

When to Order the STI-6516

Order this when Alarm Lock Trilogy or similar keypad hardware is specified for a door that experiences any of the following: direct rain or snow exposure, temperatures below freezing, high-traffic corridors with risk of impact damage, outdoor gates or parking structure access points, or coastal environments with salt air and high humidity. It's also the right answer for interior installations near commercial kitchen steam, laundry rooms, or any area with heavy airborne moisture.