The Puffco Proxy Carb Cap & Tether is a 4-pack of replacement carb caps with attached tethers for the Puffco Proxy. The tether keeps your cap connected to the device so it's always within reach and never gets lost mid-session. At $29.99 for four, it's the most practical Proxy accessory you can stock up on — because losing a carb cap should never be what ends your night.