38mm Oyster Mushroom Grow Bag Caps – Lock Ring, Sealable, Replaceable Filter
Power your Oyster harvests with these upgraded caps. Built for rapid colonizers (Pleurotus strains), the full bore 40mm removable filter delivers high gas exchange to fuel explosive mycelial runs on supplemented or pasteurized substrates.
Key Features:
- Unscrewable Removable Filter: Open easily for filter replacement.
- Autoclavable & Reusable: Durable PP handles repeated sterilization.
- Maximum Air Flow: Large 40mm bore feeds oxygen-hungry mycelium for faster colonization.
- Secure Red Lock Ring: Vibrant color + airtight seal blocks contaminants.
- Versatile: Works with layflat bags and supplemented mixes.
- Easy Use: Pull bag through ring, plug with filter cap – sterilize.
Why This Beats Standard Caps? Perfect for high-GE needs of mycelium runs – unlike smaller spawn caps, this supports rabid growth without stalling. Replacable filter adds pro flexibility.
Streamline fast, high-yield Oyster runs today!


















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