The two black sealing O-rings, diameter: 46 mm, are mounted in the extraction head gasket and the filter unit. The black sealing O-ring in the extraction head gasket ensures that the extraction agent cannot leak upwards, meaning that the extraction agent flows down through the ADDIPURE PEO extractor and out via the opening in the filter unit with the 3-layer PEO filter system. The second black sealing O-ring in the filter unit ensures that the extraction agent can only pass through the round opening via the filter system. The ADDIPURE PEO extractor black sealing O-rings are resistant against extraction agents such as ADDIPURE Dimethyl Ether (DME) and ADDIPURE n-Butane. The sealing O-rings may develop fine tears, depending on the number of extractions performed or the age of the rings. If the sealing O-rings become hard and brittle like this, they need to be replaced. This will ensure that the extraction agent flows down correctly through the extraction tube and out through the filter unit. Technical data Sealing O-ring diameter: 46 mm Sealing O-ring thickness: 4.5 mm Total weight: 7 g Dimethyl Ether (DME) and n-Butane resistant Guarantees the highest possible purity levels of the extract, through a combination of the 3-layer PEO filter system with ADDIPURE Dimethyl Ether DME (99.99% purity) or ADDIPURE n-Butane (99.39% purity) and ADDIPURE PEO extractors. Our ADDIPURE products have been designed in concert with leading engineers and designers from Switzerland and across Europe and have been developed using cutting- edge technology. Here at ADDITEQ we are dedicated to developing and producing Europe’s finest plant-material extraction equipment for high-purity essential oil extracts. The ADDIPURE PEO range has been designed to ensure that pure extract can be obtained as efficiently and easily as possible. ADDIPURE products are a byword for Swiss quality, functionality and sustainability. Swiss quality since 2014. www.additeq.com