Plumbing

https://growtopiawiki.nbg1.your-objectstorage.com/uploads/e/e5/TreeSprites.png Splicing
The tree of this item can be made by mixing the following seeds:
https://growtopiawiki.nbg1.your-objectstorage.com/uploads/9/9c/SeedSprites.png Bathtub Seed https://growtopiawiki.nbg1.your-objectstorage.com/uploads/9/9c/SeedSprites.png Green Block Seed

Plumbing is a splicable solid foreground block.

Trivia

Plumbing's appearance is a reference to Nintendo's Super Mario Bros, whose protagonist, Mario, famously travel down similar green pipes, and is a plumber. This is further reinforced by the fact that there are other Mario reference items, like Venus Guytraps and Sidewalk Blocks.
Placing 2 Plumbings will cause them to connect, thus creating a continuous pattern.