Yaen (Japanese fishing technique) and horse mackerel cooler protein skimmer for use with horse mackerel buckets. The bottom has a hose, so you can cut the hose and air hose with scissors to adjust the length. The cap (intake) is circular, so it can be adjusted 360°. I think one drain (exhaust) is sufficient if it can handle the exhaust. Drain cap included. The 10cm mark on the left side of the measuring tape is the cap. All hoses are 6mm outer diameter and 4mm inner diameter. These are air pump hoses. Length: Approximately 23.5cm. The 8th and 9th photos are of my own skimmer in use, not the item for sale. Please refrain from purchasing if you are sensitive to minor imperfections. #Yaen #HorseMackerelCooler #Skimmer #Nomase (fishing technique) #AirLift