Large Walk-In Polytunnel Greenhouse | 4m Garden Grow House with Built-In Sprinkler System OUTSUNNY

Transform your garden into a thriving space for plants, vegetables and flowers with this spacious Outsunny polytunnel greenhouse
Designed for durability and convenience, this 4m walk-in greenhouse features a built-in sprinkler system that connects directly to your garden hose, keeping your plants consistently hydrated with ease. The strong galvanised steel frame is reinforced with diagonal bracing rods for stability, while the 140gsm reinforced PE cover provides reliable protection from the elements, helping crops grow stronger for longer.

Complete with a wide roll-up front door and multiple mesh windows, this tunnel greenhouse ensures excellent ventilation and easy access for daily care. Extended cover edges, guy ropes and ground stakes secure the structure firmly in place, making it a practical solution for gardeners looking to expand their growing capacity with minimal effort.

Key Features:

• Integrated Sprinkler System – Built-in water pipe connects to hose for quick and easy plant hydration

• Heavy-Duty PE Cover – 140gsm reinforced with inner grid design to resist tearing and extend durability

• Galvanised Steel Frame – Φ24mm tubing with diagonal bracing rods provides strong, rust-resistant stability

• Spacious 4m Walk-In Design – Ample room for vegetables, herbs and flowers in large quantities

• Wide Roll-Up Door – 160cm opening for easy entry and access to plants

• Mesh Roll-Up Windows – Multiple 35 x 35cm openings promote airflow and temperature regulation

• Secure Setup – Extended 15cm cover edges, guy ropes and ground stakes included for added wind resistance

Specifications:

• Colour: Green

• Material: Galvanised Steel (Φ24mm), 140gsm Polyethylene

• Overall Dimensions: 399L x 298W x 198H cm

• Door Size: 160W x 167H cm

• Window Size (each): 35W x 35H cm

• Built-In Water Pipe Diameter: Φ20 mm

• Suitable Hose Inner Diameter: Φ13 mm, Φ19 mm

• Extended Edge Width: 15 cm

• Windproof Level (fully fixed): 4–5

• Assembly Required: Yes (two people recommended)

• Brand: Outsunny

What’s Included:

• 1 x Large Walk-In Greenhouse

• 4 x Ground Stakes

• 4 x Guy Ropes

• 1 x Instruction Manual

Perfect For:

• Large-scale gardening – Spacious design accommodates multiple rows of plants, fruits and vegetables

• Effortless watering – Built-in sprinkler system ensures consistent hydration

• Year-round cultivation – Protects crops from wind, light rain and cooler conditions

• Practical garden use – Mesh windows and roll-up door for easy ventilation and access

• Durable outdoor setup – Galvanised steel frame and reinforced cover for long-lasting performance

Outsunny 4m walk-in polytunnel greenhouse | Garden grow house with built-in sprinkler system, galvanised steel frame and reinforced PE cover

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