Professional-grade grain jar lids engineered for serious cultivators. Built with medical-grade silicone injection ports, reinforced 0.3-micron filter patches, and heat-resistant PP5 construction with silicone o-ring seals. The gold standard for contamination-free grain spawn preparation that performs flawlessly through hundreds of autoclave cycles.
 
Perfect For
- Making grain spawn for bulk cultivation projects
- Sterilizing grain in wide-mouth mason jars
- Creating master spawn jars for long-term use
- Cultivators who demand reliable, reusable equipment
- High-volume operations requiring consistent performance
 
Why Growers Choose These Lids
Silicone O-Ring Seal — Superior leak-proof performance during sterilization and storage, far exceeding standard metal-on-glass seals
PP5 Construction — Food-safe polypropylene rated to 330°F withstands repeated autoclave cycles without warping or chemical leaching
Reinforced 0.3-Micron Filter Patch — Industrial-grade filter material maintains sterile barrier through hundreds of sterilization cycles
Medical-Grade Silicone Injection Port — Premium self-healing silicone stands up to hundreds of needle insertions without tearing or leaking
Fully Autoclavable — Lid, filter, port, and o-ring all rated for repeated pressure sterilization
Fits Standard Wide-Mouth Mason Jars — Perfect fit for Ball, Kerr, and all standard wide-mouth jars (jar not included)
 
The Myco Powered Difference
Most grain jar lids cut corners with thin plastic bodies, basic rubber seals, and injection ports that fail after a few dozen uses. We engineered every component for longevity - heat-resistant PP5 bodies that won't warp, silicone o-rings that maintain perfect seals, medical-grade injection ports, and reinforced filter patches that perform flawlessly cycle after cycle.
The result? Lids that professional cultivators depend on for years of reliable service. This is the equipment serious growers build their operations on.
 
Order your 6-pack now. Built to last, guaranteed quality, competitively priced.
(Wide-mouth mason jars sold separately)