The Mason Bottle Plastic Cap will fit over the metal ring on any regular-mouth mason jar. 

This product includes:

• One polypropylene plastic cap.

• Prevents leakage when secured over the Mason Bottle Silicone Nipple
• When on the go, protects and keeps the nipple sanitary
• 100% Made in the USA 
• Dishwasher-safe

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The Original Mason Bottle or the Mason Bottle DIY Kit, if you're looking to add nipples or a sleeve to your order.