This Spawn Jar Lid Kit includes everything you need to build your own spawn and liquid culture jar lids. Each wide-mouth lid is precision pre-punched to exact specifications, making assembly quick, simple, and reliable—even for beginners.

The kit allows for flexible setup preferences: some growers install the gas exchange filter beneath the lid for liquid culture and spawn jars, while others prefer mounting the filter on top of the lid. Both configurations work great, so you can build them the way you prefer.

What’s included:

• 50 pre-punched wide-mouth mason jar lids
• 100 self-healing injection ports
• 128 self-adhesive 0.22 micron gas exchange filters

Assembling your own lids not only gives you full control over your setup, but also saves you money compared to buying pre-assembled lids.