Ag Pipe 100mm x 20m | Slotted & Socked Drain Coil

Ag pipe (100mm × 20m flexible drain coil) runs along the base of a retaining wall to collect groundwater and carry it away — the part that stops water pressure building behind the wall. Choose slotted or socked (filter-sock). Delivered Australia-wide by Retaining Walls Direct.

Written and product-checked by the Retaining Walls Direct team — supplying retaining wall drainage products across Australia. Last updated: June 2026.

Ag pipe 100mm × 20m

Laid at the footing behind a concrete sleeper wall, surrounded by gravel and geo matting, ag pipe discharges water to a legal outlet. Essential on any wall over ~600mm. See the drainage guide.

Slotted vs socked

• Slotted — use when wrapped in geo matting or surrounded by clean gravel.
• Socked — pre-wrapped filter sock keeps fines out; ideal for sandy or loamy soils.

Specifications

Complete the drainage system

Pair with geo matting and gravel, or a complete drainage kit.

Buying with confidence

• Australia-wide delivery with a same-day freight quote.
• Google-reviewed service and trade support.
• Returns: see our returns & delivery policy.

Get a quote or contact the team.

Frequently asked questions

Slotted or socked?
Socked (filter sock) for sandy/loamy soils; slotted when wrapped in geo matting or clean gravel.

Do I need ag pipe?
Yes for any wall over ~600mm — it's the base of a working drainage system.

Can you deliver to me?
We deliver across most of Australia. Send your details for a quote.