How to connect a rain water tank to a square down pipe

Written by c.l. rease
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How to connect a rain water tank to a square down pipe
Adaptors convert a square down pipe to a round opening. (windows image by palms from

Collecting rainwater reduces your water bill while conserving water. To collect rainwater, you need to collect rainwater in rain gutters and direct the collected water to a storage tank. A common problem arises when you attempt to connect the square downspout outlet of a rain gutter to the round water inlet of the storage tank. You need a special adaptor, designed to convert a square outlet to a round inlet, that will not corrode from the constant exposure to rainwater.

Skill level:

Things you need

  • 1/4-inch hex head adaptor
  • Screw gun
  • Downspout tile adaptor
  • 1/4-inch stainless steel self-tapping screws

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  1. 1

    Remove the screws connecting the down pipe to the square outlet of the rain gutter with a 1/4-inch hex head adaptor fitted into a screw gun.

  2. 2

    Remove the hangers attaching the rain gutter to your house.

  3. 3

    Connect the downspout adaptor to the rain gutter. Slide the square hole of the downspout adaptor over the square outlet exposed when you removed the down pipe. Push the adaptor tight to the bottom face of the gutter. Run a 1/4-inch stainless steel self-tapping screw into each side of the adaptor. Ensure each screw penetrates the flange of the rain gutter outlet.

  4. 4

    Slide the pipe connecting to the water tank over the round end of the downspout adaptor.

  5. 5

    Secure the water tank piping to the downspout adaptor with four equally spaced 1/4-inch stainless steel self-tapping screws.

Tips and warnings

  • Use proper ladder safety techniques if you use a ladder to access the down pipe connection to the rain gutter.
  • Steel and galvanised screws corrode when subjected to moisture and can spoil your collected rainwater.

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