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