Monotub Bungs (40mm)- For Mushroom Growing

40mm Monotub Bungs are designed to provide a secure, airtight seal for monotub air holes during mushroom cultivation. Manufactured from durable, flexible material, these reusable bungs feature a slight taper to ensure a snug fit in standard 40mm holes, allowing you to easily control Fresh Air Exchange (FAE) and maintain the ideal growing environment throughout the cultivation process.

• Fits standard 40mm monotub holes
• Made from durable, flexible material
• Slight tapered design for a secure, snug fit
• Creates a tight, airtight seal
• Reusable and easy to clean
• Ideal for controlling Fresh Air Exchange (FAE) during colonisation and fruiting
• Suitable for monotubs, fruiting chambers, and DIY mushroom cultivation projects
• Supplied in blue or red for easy identification
• Built to withstand repeated use

Perfect for Monotub Builds

These 40mm bungs are ideal for sealing ventilation holes during substrate colonisation and can be easily removed or adjusted as your mushrooms enter the fruiting stage. Pair them with our Sterilised Wheat Grain and CVG Substrate to complete your mushroom cultivation setup.

Built for reliability and ease of use, these 40mm Monotub Bungs are suitable for both beginner and experienced growers. Whether you’re building a new monotub or replacing worn bungs, they provide a simple, reusable solution for maintaining the ideal balance of Fresh Air Exchange (FAE) throughout the growing process.

CLICK HERE FOR THE GUIDE ON BUILDING A MONOTUB