# Eillion Large 3-Flap Sliding Glass Door Dog Door, Adjustable Height

The large 3-flap door adjusts from 75 7/8 to 81 inches for pet access through a sliding glass door.

- [Original product page](https://www.ofertitastop.com/us/product/eillion-large-flap-sliding-glass-door)
- [View offer](https://www.ofertitastop.com/us/visit/eillion-large-flap-sliding-glass-door)
- Market: US
- Language: en-US
- Currency: USD
- Product updated: 2026-11-02T02:53:53.081Z
- Brand: Eillion
- SKU: ofertitastop-us-180390
- Category: Animals & Pet Supplies > Pet Supplies > Pet Doors
- Source store: amazon US
- Active deal: Yes
- Price: 188.99 USD
- Previous price: 209.99 USD
- Discount: 10%
- Rating: 4.1 / 5
- Reviews: 1008

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## Description

Give a large dog a convenient route between the home and patio while keeping the sliding glass door setup in place. This Eillion pet door adjusts to sliding door frames from 75 7/8 inches to 81 inches high and is designed for pets weighing up to 100 pounds.

Its three-flap system and double magnetic closures help block drafts, rain, and wind. The semi-transparent flap gives pets a view through the opening, while a safety lock lets you control when they can pass through.

The openable design also provides access through the door for people moving items between the house and backyard. Its swing direction depends on which side of the sliding door frame you install it on, so choose the placement that suits your space.

## Specifications
- Type: Sliding glass door pet door
- Size: Large - 3 Flap
- Material: Glass and metal
- Adjustable height: 75 7/8 inches to 81 inches
- Glass door width: 14.8 inches
- Flap size: 10 inches wide by 16 inches high
- Pet weight: Up to 100 pounds
- Closures: Triple-flap system with double magnetic closures
- Security: Safety lock

## How to use it
Measure from the top track to the inner bottom track of the aluminum sliding door frame, then select an installation position that matches the door’s swing direction. When installed on the left side of the glass door, the fixed swing opens inward, on the right side, it opens outward. The swing mechanism is not adjustable, so deciding on the side before installation helps align the opening with your indoor and outdoor layout.

Installation requires drilling holes in the door frame. Once fitted, the pet can use the flap to move between the home and patio, and the safety lock lets you manage access when needed. The triple-flap arrangement and magnetic closures are designed to help protect the home from wind, rain, and drafts while keeping a pet passage available.

A fixed pet opening and an openable sliding-door design serve different routines. This model suits households that want pet access through a sliding glass door and also value being able to open the pet-door assembly for people moving items in or out of the backyard.

## Who it’s for
This large-size door is intended for households with a pet weighing up to 100 pounds and a sliding door frame within the stated adjustable height range. The semi-transparent flap measures 10 inches wide by 16 inches high, giving the pet a visible passage. Its adjustable height is useful when choosing a pet door for a patio or villa-style sliding glass door, provided the frame measurement matches the specified range.

## Questions before you buy
**How do I check whether it fits my sliding door?** Measure from the top track to the inner bottom track of the aluminum frame. The adjustable height range is 75 7/8 inches to 81 inches, and the stated glass door width is 14.8 inches.

**Can I choose whether the flap opens inward or outward?** The swing direction is fixed by the installation side: left-side installation opens inward, while right-side installation opens outward. The mechanism itself is not adjustable.

**What helps protect the opening from the weather?** The door uses three flaps and double magnetic closures, designed to help block drafts, rain, and wind. A safety lock provides a way to control pet access.

## Is it worth it?
For households that want a large-pet passage through a sliding glass door, this model combines an adjustable frame height, a semi-transparent flap, and a locking feature in one openable design. Check the frame measurement and choose the installation side to match the required swing direction, then the door can support everyday pet access between the home and backyard.

## Images

![Eillion Large 3-Flap Sliding Glass Door Dog Door, Adjustable Height — 1](https://www.ofertitastop.com/i/Oa48-xLJ5yFouvYsvHQnvJBobdzfAAO7r4GtyxkbV8xglxwd8UAoNl3XN7qvaSKEFh1NyuRGNl3jYrTh-_HWTHJdVT0e9HGhJGMv8leLo0aEw6_Rr3acWXrvgA.jpg)

![Eillion Large 3-Flap Sliding Glass Door Dog Door, Adjustable Height — 2](https://www.ofertitastop.com/i/AbfM8ueisY8VPQAqKJVjTdkgfUt8SlYmw_qrlEbBLHaqW1VrZSTeBiK3cECTNeUKWupS3B7p5WO6XBLI0jTIyTUNDzscBDXxTiQe_25PL5HUXFyg10b8nRS0pQ.jpg)

![Eillion Large 3-Flap Sliding Glass Door Dog Door, Adjustable Height — 3](https://www.ofertitastop.com/i/7wIMRgdq2g1p_Yrifnxba92wAfxqoxGBft0BHqoEdobuGbKcq9jbW-DD_oiFh3YxXTkXGUyKYBImbzkEyK9BqKd2ckadxlQGhYlBOwSMN1_3ycSDmShLQtFc3w.jpg)

![Eillion Large 3-Flap Sliding Glass Door Dog Door, Adjustable Height — 4](https://www.ofertitastop.com/i/2Vq91M3gic-UrHPE08othRKsR8inFVp3aINAj4O40lXQieNWeTm3kjr2v-9qDfRPmYXtmJ-worDG_sWa3MezXBHpgdnjAgk3KZUM0W6AxjQSocXyO5ehjFi8-g.jpg)

![Eillion Large 3-Flap Sliding Glass Door Dog Door, Adjustable Height — 5](https://www.ofertitastop.com/i/_uxW5_z8vxTCuVDM4y6cZMV0pwkCTzI-L1MJB4ljhZCyT0Ca0F1oVoNPANA_EOqltHai2VLemeRUIVYZ4LDF7K0yijfUZmpnLSiT2Q9amr77vjXKCQPfoOiCpQ.jpg)