The FerMonster Solid Lid (1, 6 & 7 Gallon) is intended to be used with the 6 and 7 gallon FerMonster PET Plastic Carboys. This product doesn't come with the O-ring. You can get one.
Specifications:
Compatible with 1, 6 & 7 Gallon PET Plastic Carboys
Does not come with o-ring, click for compatible o-ring
