9mm Blue Barbed Double Inlet Y Piece - Merge or Split 9mm Irrigation Lines
Best for: Growers running Nutriculture-style 9mm irrigation tubing who need to join two lines into one, or split one into two.
Our thoughts
Every drip or recirculating setup ends up needing one of these eventually, whether you're combining two feed lines or splitting a supply to two pots. It's a 50p part that saves you re-plumbing a whole section of tubing. Keep a few spares in the parts box.
This is a Y-shaped barbed connector with two inlet barbs and one outlet, sized for 9mm irrigation tubing. It's the standard tube diameter used across a lot of UK recirculating hydroponic hardware, including Nutriculture's own Wilma and Aquafarm-style systems, so it's a natural fit if you're already running that ecosystem of tubing and fittings.
The barbed ends grip the inside of 9mm tube when pushed home, holding under normal low-pressure recirculating system flow without needing clips in most setups, though a cable tie or hose clip adds security on runs that get disturbed often.
How it compares
This is a basic commodity fitting rather than a branded system component, priced accordingly.
- Vs buying a full manifold or pre-made tubing kit: a Y piece lets you extend or reconfigure an existing 9mm system without replacing tubing you already own.
- Vs push-fit connectors (John Guest-style): barbed fittings like this one are cheaper and simpler, though push-fit connectors release more easily for maintenance.
- Vs threaded T and Y fittings used in larger-bore irrigation: this barbed version is sized specifically for the thinner 9mm tube common in smaller recirculating grow systems, not larger-bore mainline irrigation.
It's a cheap way to reconfigure 9mm tubing runs without buying a new kit.
Usage guidance
Fitting is quick, but a couple of details matter for a leak-free join.
Fitting
Push each 9mm tube fully onto the barbed inlets and the outlet until they seat against the shoulder of the fitting - a half-hearted push is the usual cause of a leak here.
Combining flow
Use the two inlets to merge two separate feed or return lines into a single line heading back to the reservoir or pump.
Splitting flow
Run it in reverse - one line in, two out - to feed two pots or drip points from a single supply line.
Technical specifications
- Connection size: 9mm barbed (both inlets and outlet)
- Shape: Y piece, double inlet / single outlet configuration
- Colour: Blue
- Material: Plastic barbed fitting
- Compatible systems: 9mm irrigation tubing, including Nutriculture Wilma/Aquafarm-style setups
Who this is for
- Growers running or extending a 9mm tubing recirculating system
- Anyone building or repairing a multi-pot drip or return manifold
- Growers who want spares on hand for quick fixes rather than a full retube job
A useful spare part to keep on hand for anyone running 9mm-based irrigation hardware.
Our take
It's not exciting, but it's the sort of fitting that turns a re-plumbing job into a five-minute fix. Cheap, compatible with the tubing most UK growers already have, and does exactly what it should.
Does exactly what it should, day in, day out - grab a few for the parts box while you're at it.
