Grain Spawn Lid Rebuild/DIY Kit - PTFE Filter Stickers with Heavy Duty Injection Ports

Build your own mushroom grain spawn lids, or rebuild existing lids using this parts kit. This kit is a DIY kit designed to allow you to create your own mushroom grain spawn jar lids without any sealant or glue. It is suggested that you use polypropylene (PP) lids for this project. You can choose to use either wide mouth or regular mouth lids. This kit includes heavy duty extra thick injection ports and .45 micron PTFE filter stickers. When making lids, simply drill a 1/2" hole for the injection port. The port will fit snuggly into the hole without any sealant. For the sticker part, drill a 1/4" hole for the PTFE sticker to fit over.