Promate Universal Snorkel Keeper Durable Flexible Silicone It Features: Compatible to almost all snorkels. Oval, round, etc. Durable and flexible silicone material. Universal soft snorkel keeper. It allows you to attach the snorkel to your mask. Introducing the Promate Universal Snorkel Keeper, made with durable and flexible silicone material. This soft, universal keeper is compatible with a wide variety of snorkels, including oval and round styles. Easily attach your snorkel to your mask with this reliable accessory.