Land drain T vs X vs 4-way — which junction for the job?

The join guide’s short note on Y vs T is enough for a simple herringbone. Real gardens are messier: a patio stub at right angles, two laterals meeting a main at one point, or a cross where runs meet. That is when you need the difference between a T, an X / cross, and a 4-way — and when you should still buy a Y instead.

Critical size fact first: T, X and 4-way are 60mm and 80mm only. The Y junction also covers 50mm and 100mm. Do not order a T for 100mm coil; it is not on the listing.

Background on push-fit joins: how to join land drain pipe.

Quick role compare

• T junction — three outlets — 60 & 80mm — side branch on a land drain line
• X junction — four outlets — 60 & 80mm — X / cross for crossing or branching runs
• 4-way junction — four outlets — 60 & 80mm — joining land drain runs / cross connection for branching a layout
• Y junction — three outlets — 50, 60, 80 & 100mm — side run into a line (herringbone)

All of the T / X / 4-way listings give country of origin as United Kingdom. None of them publish a degree rating beyond the shape name (T, X, 4-way, Y). Stick to that. Leave full size tables and specs on the product pages.

When a T is the right answer

Use a T when you need a side branch into a straight run and the trench forces that branch toward a right angle — patio edge, path stub, short interceptor feeding a main. Three outlets: main through, plus the branch.

Prefer a Y when laterals can feed in the direction of flow on a herringbone. Fighting a Y into a hard corner is the wrong fight; that is a T (branch) or an elbow (same run turning).

When you need four outlets: X or 4-way

Both the X and the 4-way are listed with four outlets in 60 and 80mm. Listing language:

• X — “X / cross junction for crossing or branching runs”
• 4-way — “Four-way junction for joining land drain runs” / “Cross connection for branching a drainage layout”

Choose the product page that matches the layout you are building. Do not invent a finer geometry difference than the copy states. If one outlet is unused, cap it with an end cap so soil cannot enter — see grid vs solid end caps.

Why Y still matters (and covers 50 / 100mm)

Herringbone laterals are still the default for a wet lawn. Y has three outlets in a Y layout and is the only junction of this set in 50, 60, 80 and 100mm. If your main is 100mm, or you are using leftover 50mm coil, Y is the junction that matches — not T, X or 4-way.

To step between land drain sizes on a straight run, use a land drain reducer adapter — options are 80–60mm, 100–60mm and 100–80mm.

Sizing and fit — check before you order

Internal pipe sizes differ by brand. Measure your pipe or check the product size notes and check fit before ordering. Shape Shop will release outside-diameter (OD) fittings soon for wider compatibility — no launch date or SKUs yet.

More on coil sizes: land drain sizes: 60mm, 80mm or 100mm?. We do not sell the coil — buy pipe from a merchant and match the fitting.

Related products

• Land drain T junction — 60 & 80mm — right-angle side branch
• Land drain X junction — 60 & 80mm — cross / branching with four outlets
• Land drain 4-way junction — 60 & 80mm — four-way join for branching a layout
• Also: Y junction — 50, 60, 80 & 100mm for herringbone and for 50 / 100mm coil

Match the fitting to the coil size first, then to the layout. Keep joins on the corrugations, keep the fall, and keep foul separate. Layout help: how to install a garden land drain.