Pack of 15 black phenolic plastic screw caps with 28-400 thread finish and built-in PolyCone liners. Designed to create a tight, leak-resistant seal on compatible jars and bottles.
These black phenolic plastic screw caps come in a pack of 15 and are designed for containers with a 28mm 28-400 continuous thread finish. Their durable phenolic construction and clean black appearance make them a practical closure option for a wide range of storage, packaging, and laboratory-style applications.
Each cap features a built-in PolyCone liner that helps create a tight, leak-resistant seal when properly fitted to a compatible bottle or jar. The liner also provides an effective barrier against oils, chemicals, and volatile substances, making these caps especially useful where a more secure closure is needed.
These caps are intended for jars and bottles with a 28-400 continuous thread finish and are not suitable for short-thread bottle types. Made in the USA, they are also eligible for replacement under a 30-day policy if received damaged or defective.
