A Rubber Tap is a utility block with two variants, created by right-clicking the trunk of a natural or sapling-grown Rubber Tree with a Weedwood Bucket or Syrmorite Bucket while having Reed Rope in the inventory (it will consume the rope and bucket). The tap will be empty at first but will fill with liquid rubber over time.
When full, it can be removed by simply breaking it, yielding either a Weedwood or Syrmorite Rubber Bucket (depending on the type of tap) and a Reed Rope. Its rubber can also be transferred to another bucket by simply right-clicking any empty bucket type on the tap, leaving the tap on and draining it so it can tap more liquid rubber.
Syrmorite Rubber Taps tap rubber slightly faster than Weedwood Rubber Taps, and the bucket they yield can be reused.