Check the listing for details. Waterdrop Sight Glass Spigot, Clear View Water Level with Red Floating Ball. Condition: New. Listed at 39.99 USD. Product Description 【Accuracy】: The red floating ball in the sight glass spigot helps to tell the water level clearly, allowing you to see at a glance how much water remains in the lower chamber.【Leak-free】: The glass water level spigot firmly connects with the lower chamber without any crannies. You can worry less about the water leakage.【Built to last】: The main body of the faucet is electroplated with metal material, giving it a stronger and durable structure.【Hassle-free installation】: There is a complementary wrench in the package, which you can use to assemble the spigot conveniently.【Compatibility】: The Waterdrop water level spigot is compatible with the original Travel, Big, Royal, Imperial Water Filter System; Alexapure Pro Water Filtration System; Waterdrop King Tank Series. Please note this is a compatible spare part. This filter is not sourced by or sponsored by Berkey. The manufacturer's name has been used for reference purposes only. Waterdrop is an independent brand. On Feb-09-22 at 00:50:22 PST, seller added the following information: