Neck size: 45-400 threaded One-handed operation: Frees operator's hands Versatile: Fits Menda 8 oz plastic (35601, 35602, 35603) bottles and 35608 glass bottle High quality polypropylene: The pump is durable and lightweight Convenient swing lid: Reduces odors and maintains purity Made in the United States of America for Superior quality This item is made and stocked in Santa Barbara, CA.