Active Carbon FilterPrevents outside odor coming from tank by connecting it at the highest point along the breather hose.Specifications: Weight: 0.15 kg/.25 lbs; Type: Black water; Adjustable Ports: With 16, 19, & 25mm / (3/8a ^2, 3/4a ^2, 1a ^2) ; *Certification: CE marked 94/25/ECC, ISO8846 Small Craft, Electromagnetic compatibility 89/336/EEC, EN51014 1993/radio disturbance - cis2:mm5mnJlm -