Filament lid replacement for 4L jars. With hydrometer and PC4-M10 connector. No drilling or anything needed just replace the lid.
Compatible with following jars from Vtopmart: https://www.amazon.nl/dp/B08CKB2B12
Hygrometer: https://nl.aliexpress.com/item/1005003075779370.html
You will also need PC4-M10 connectors and PTFE tube