To order correct cap size measure the outside diameter of your tubing.
Then select how many you want using the "Pack Size" drop down. (If you need a quantity that is not listed combine the "Pack size" by adding multiple "Pack Sizes' to you cart prior to check out.
If ordering multiple sizes add all items to your cart and then select " Request total from seller" from your cart to enable me to apply combined shipping discounts.
**DIMENSIONS ARE FOR INSIDE DIAMETER OF THE CAP**