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Inlet Pump
  • Inlet Pump item spriteold Inlet Pump item sprite
  • Inlet Pump placed
Stack digit 9.pngStack digit 9.pngStack digit 9.pngStack digit 9.png
Placeable✔️ (2 wide × 2 high)
Use time15 (Very fast)
TooltipSends water to outlet pumps
RarityRarity level: 0
Research1 required
Outlet Pump
  • Outlet Pump item spriteold Outlet Pump item sprite
  • Outlet Pump placed
Stack digit 9.pngStack digit 9.pngStack digit 9.pngStack digit 9.png
Placeable✔️ (2 wide × 2 high)
Use time15 (Very fast)
TooltipReceives water from inlet pumps
RarityRarity level: 0
Research1 required
Using Pumps to pump water from one container to another. Note the wire placement, and how an outlet pump stops transferring water when fully submerged.

Inlet and Outlet Pumps are mechanisms used to transport liquids (water, lava, honey, and shimmer(Desktop, Console and Mobile versions)), without having to construct pathways through blocks or rely on gravity. Instead, an Inlet and Outlet Pump need only be connected to each other with Wires and activated, which transfers fluid from the Inlet Pump to the Outlet Pump. Each activation transfers up to four tiles of liquid. For continuous automated pumping, a timer can be used.

Despite its appearance as a pipe that takes in liquid from beside it, an Inlet Pump must be submerged in liquid, as it removes liquid that lies directly over its graphic, and does so equally from all of its 2×2 tile space. Similarly, an Outlet Pump spawns liquid directly over its graphic, and does so equally over all of its 2×2 tile space.



ResultIngredientsCrafting station
Inlet PumpInlet PumpIron AnvilIron Anvil
Lead AnvilLead Anvil
Outlet PumpOutlet Pump


  • If the Outlet Pump becomes completely submerged, it will stop pumping.
  • Up to 5 Inlets and 5 Outlets can be connected using a single path of Wires. The fluid transfer rate is increased accordingly, without the need for additional Wires to act as "pipes".
    • If there are more than 5 Inlets connected to more than 5 Outlets, then the 5 Inlets closest to the trigger (timer, Switch, etc.) along the Wire will transfer liquid to the 5 Outlets closest to the trigger along the Wire.
  • An Inlet Pump will only take up liquid if it is connected to an Outlet Pump.
  • (Old-gen console and 3DS versions) Assuming the Inlet Pump is fully submerged, Outlet Pumps produce slightly more liquid than the Inlet Pumps take in.


  • On the Old-gen console version Old-gen console version and Nintendo 3DSNintendo 3DS version version, the Outlet Pump's ability to produce more liquid than an Input Pump takes in can be exploited in multiple ways:
    • Tanks of liquid can be created by repeatedly sending liquids through a pump system. Only enough liquid to submerge the Inlet Pump is required, and any extra liquid produced from the Outlet Pump can be used to fill the tank, providing infinite liquid as long as a separate tank for actually producing the duplicate liquid is maintained.
    • Ponds of water, such as fishing ponds, can easily be created using only a small amount of liquid.
  • "Lava falls" can be made by using pumps, which can be used as an NPC-killing device or a means of protecting one's house from enemies.
    • While of little use compared to lava falls, aesthetic waterfalls can also be made using pumps.
  • Pumps have a rarity of Rarity level: 0 and will thus be destroyed when submerged in lava. Therefore, care should be taken to ensure that a pump never becomes unseated while any lava is present, such as by mining the Inlet Pump, or by placing the Outlet Pump on a platform (as lava destroys all placed platforms except for Obsidian, Stone(Desktop, Console and Mobile versions), and Ash Wood(Desktop, Console and Mobile versions)). The lava should first be drained or converted to solid blocks before attempting to remove the pump.
  • Pumping can be automated by placing a Liquid Sensor(Desktop, Console and Mobile versions) directly under an Outlet Pump. The sensor will be activated each time liquid comes from the Outlet Pump and can send this signal back to the Inlet Pump.
  • Because pumps can move shimmer(Desktop, Console and Mobile versions), it can be relocated from the Aether(Desktop, Console and Mobile versions) before the Moon Lord(Desktop, Console and Mobile versions) is defeated and the Bottomless Shimmer Bucket(Desktop, Console and Mobile versions) becomes available.


  • Both pumps' tooltips wrongly describe that they are used to send or receive only water, whereas they send and receive any liquid.


  • Desktop Removed a glitch where outlet pumps would produce more liquid than they take in.
  • Desktop 1.2: Stack limit increased from 250 to 999 and maximum distance increased from 1000 to 2000 wire.