This is an accessory compatible with the MHarbor 375 breast pump, including a silicone diaphragm & milk collector. It has a reservoir capacity of approximately 210 milliliters, eliminating the need for frequent emptying, thus providing added convenience for mothers. Made from zero BPA food-grade silicone, it ensures safety and is easy to clean. With its lightweight design weighing only 4.87 ounces, it is a convenient choice as a spare accessory for breast pumping.