Ultraliner MS390U (Pack of 4) The Ultraliner MS390U is a high-quality milking liner designed to deliver dependable performance in milking systems using Manus 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 MS390U features an orifice diameter of 23.5mm and a total length of 300.0mm , 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 MS390U operates without an air vent, making it suitable for milking systems where controlled air admission is not required. Maintaining balanced vacuum levels 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 constructi