These screw caps are compatible with our PYUR glass concentrate containers like the 2,000ML and the 500ML storage bottles . Designed to prevent spilling or leakage, they're perfect for keeping product safe, secure, airtight, and odor-resistant. What's not to love about a bottle that helps do it all? Concentrate products are too often left out or wrapped up in plastic instead of secured properly within a concentrate container. Get stocked up on reagent bottle screw caps to have ready and waiting of your customers. Take your pick between orange and blue, or pick a combination of both!