North Mountain Supply - 38mm Black Plastic Screw Caps with F217 Foam Liner (Pack of 15) - Leak Proof Bottle Lids for Home Brewing, DIY Projects & Chemical Storage - Airtight Container Caps for Mason Jars, Water Bottles & Laboratory Use

38mm Black Plastic Screw Caps With F217 Foam Liner - Pack of 15. This cap features ribbed sides allowing for easy application/removal and a matte top. The F217 (foam) liner inside is a general liner that is compatible with most products. Fits all jars and bottles with a 38mm (38-400) thread. We warrant our products in the event that they arrive damaged or defective - Covered under our 30 day hassle free replacement program.