Stock number 3CFAL0201PW is a continuous thread 20-400 Aluminum Cap with a F217 Liner. This closure has ridges along the side and a smooth top. The F217 (Foam) Liner inside is a general liner that is compatible with a variety of products. Pair the 20-400 Silver Aluminum Cap with one of the matching products below. To ensure compatibility, please request a sample for testing.