Agricultural, landscape and golf course irrigation

Providing irrigation products and support all over the world since 1996.

Welcome to TWL Irrigation (Tonick and Underhill)

TWL Irrigation (formally Tonick Watering) was formed in 1996. Its irrigation products are used all over the world.

The famous Underhill watering accessory products are stocked by TWL: Hose nozzles, water removal hand pumps, fertiliser applicators, sprinkler audit kits, hole trimmers and many more.

A range of irrigation controllers and irrigation decoders are stocked. Compatible with the widely used Watermation Tonick, Toro Tonick, Gemini, Trident and Hunter ICC.

An irrigation decoder / solenoid in one small package, “Decoder In A Solenoid”, (DIAS) is now available. This is not much bigger than a conventional solenoid but includes the lightning protected decoder as well. With a diagnostic multi-coloured LED and the elimination of two decoder solenoid waterproof joints, the DIAS is a significant improvement in classic decoder technology. Compatible with the popular signalling protocols and many common valve types.

Complementary to the decoder families, TWL offers a range of versatile irrigation controllers. From a simple low-cost, easy installation, stand-alone, wall mount, (TW-3) through to a full Internet irrigation controller with its own embedded web pages and open SCADA protocol (RM-2). Used for city-wide irrigation networks and big golf courses.

Multi-wire irrigation controllers and PLCs that want to offer decoders can benefit from an adaptor, the NOVO. This enables the multi-wire to become a  two-wire decoder controller without massive development costs or technical risk.

For companies with their own controllers or PLC systems, but not yet with irrigation decoders, TWL offers a range of add-ons which can convert them to operate proven irrigation decoders. This avoids the technical risk and time-to-market in attempting in-house designs. These components range from a pre-programmed micro-controller and a reference design, up to ready-made interface cards, DIN rail mounting or Eurocard. The latter can communicate with the controller using a simple ASCII protocol, or Modbus RTU slave.

A decoder irrigation system has many advantages over satellite and multi-wire systems. Thanks to the quality of design and build embodied in Aquamonix and TWL irrigation decoders, unreliability and lightning damage are no longer a problem. All come with a 5-year warranty.

Underhill Golf & Sport Irrigation accessories

  • Professional 3/4 Inch Hose Nozzles and Wetting Applicator Guns
  • Toro and Rainbird Upgrade Profile Brass Sprinkler Nozzles
  • Sprinkler Testing and Auditing Equipment
  • Long Throw, Travelling and Impact Sprinklers
  • Hole trimming tools, Turbo-Trim
  • Fertilizer applicators, Pellet Pro