... accept 4. ISO9001 2008 certificate Colorful Automatic Valve Used on Storage Bags Features 1. material: PP, PE, POM 2. size ... blue, white, black, coffee, yellow 4. certification: ISO9001-2008 5. kind: mini valve, mini Ninja valve, switch valve, slide ... used on compressed vacuum bags, to help suck out air and keep the bags airtight Package 200-300 ... L/C, etc colorful automatic valve used on storage bags