We love these reusable lids for our grain spawn. We also use them for fruiting jars of Enokitake on sawdust.
Features a self-healing injection port and a second pre-drilled air exchange hole for use with poly or a filter disc. These lids take loads of sterilization abuse!
Our favourite part is they're dishwasher safe and the injection port can be easily removed and replaced for extra deep cleaning if required. BONUS: no gasket!
Available in both standard and wide mouth sizes.