Irrigation Fittings

Why fittings deserve a page

A drip system is mostly straight pipe and straight line. Everything that changes — a direction, a branch, an on/off, a pressure change, a flush point — is a fitting. And statistically, "the system is leaking" usually resolves to "a fitting is leaking". The components are cheap; the leak costs water, pressure and a search. This page is the equipment reference for that part of the system.

Joint types

The rule of thumb on HDPE: compression for everything you might touch, fusion for the backbone you won't. A mainline that's all fusion has fewer failure points; a field of compression fittings is serviceable, replaceable and what most Kenyan drip installs actually run — done properly, both are fine.

The fitting box, piece by piece

• Caps and end plugs — close every line end that isn't a flush point; an open end wastes water and drops zone pressure.
• Tees and cross tees — the branches: submain off the mainline, drip line off the submain. Sized to match the pipe pair.
• Flush fittings — the valve or capped end on every drip line that lets you flush without draining the block. Non-negotiable: see line cleaning.
• Adapters — where materials meet (HDPE to PVC at the head, pipe to filter thread, line to submain).
• Line couplers and repair kits — the field's first aid; a design that doesn't budget for spares is a design that ignores its own failure modes.
• Pressure gauge points — a tee with a gauge connection on the filter and at the zone end; the cheapest diagnostics in the whole system.

How leaks are born (and prevented)

• Under-tightened compression fittings — the ring needs its full hand-tight (+ a quarter with a tool where rated); "it's not leaking yet" is how it starts.
• Pipe cut at an angle — a 90° cut seats the fitting; a diagonal cut leaves a gap the ring can't seal.
• Debris in the joint — a grain of sand in a compression joint is a leak in a week. Wipe the pipe before every join.
• UV on the joint — some fittings age faster than the pipe; shade the head, and use rated fittings for exposed runs.
• Walk-over stress — a fitting that's walked over, driven over or tugged becomes a flex point. Route it where it can't be.

All five are installation discipline, which is why the installation service includes a pressure test of every zone before handover — a leak found in week one is a ten-minute fix; the same leak found in week six is a search.

Choosing fittings

They follow the pipes and the design: compression set for the HDPE sizes in the layout, the head's thread schedule, and a spare kit proportional to the system (a rough practice: one repair kit per two zones, plus the odd tee). The design document lists them; the quote prices them line by line — which is also how you check that a quote includes the fittings at all, because a quote without them is a system without joints.