Ultraliner FW15U (Pack of 4) The Ultraliner FW15U is a high-quality milking liner designed to deliver dependable performance in milking systems using Fullwood type liners. Manufactured to precise specifications, these liners help maintain stable vacuum levels, smooth pulsation, and efficient milk flow throughout the milking process. The Ultraliner FW15U features an orifice diameter of 25.0mm and a total length of 327.0mm , ensuring a secure and accurate fit within compatible cluster shells. Correct liner sizing is essential for maintaining proper liner movement and effective teat massage, helping promote efficient milk extraction while supporting cow comfort during milking. Designed as an unvented liner , the Ultraliner FW15U operates without an air vent, making it suitable for milking systems where controlled air admission is not required. Maintaining balanced vacuum conditions within the cluster helps ensure smooth liner operation and consistent milking performance during each milking cycle. Manufactured from durable materials that conform to BfR and RAL guidelines , these liners meet recognised standards for materials used in food-contact dairy environments. Their robust constru