Designed specifically for PAX 3, the Concentrate Insert Oven Lid Replacement and O-Rings will keep your liquid or solid concentrates safely secured inside the Concentrate Insert. The Oven Lid Replacement snaps easily into the adapter preventing splashback that could otherwise occur when heating the concentrates to the high temperatures. The O-Ring fastens around the oven lid and guarantees an airtight seal. This seal directs the vapor upward through the mouthpiece.