New Custom Lid Inserts for Kratky Mason Jars

Fits all STANDARD size Mason jars. Does NOT fit wide mouth.

Includes 4 inserts and rockwool to use as grow medium. Does NOT include jars.

These were custom designed by me and printed using upgraded PETG filament for durability and reusability.

I’ve used them to grow lettuce very successfully under standard lighting.

Simply fill a mason jar with hydroponic nutrient, insert seeded rockwool into the insert and then screw the insert into the lid of a standard mason jar (quart size works best).

The design includes a HALF MOON CUTAWAY for ease of refilling nutrient without the need to remove the lid and an INSET RIM to lock the insert into place and prevent slippage.

$1.99 shipping!