Agricultural, landscape and golf course irrigation

Welcome to TWL Irrigation, (Tonick and Underhill)

TWL Irrigation (formally Tonick Watering) was formed in 1996.  Its 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 valve decoders are stocked. Compatible with the widely used Watermation Tonick, Toro Tonick, Gemini, Trident and Hunter ICC.

A 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 controllers.  From a simple low-cost, stand-alone, wall mount,(TW-3) through to a full Internet-based 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 a versatile range of adaptors. (NOVO), (deVINCI).  This enables 2wire decoders without massive development costs or technical risk.

For companies with their own controllers or PLC systems, but not yet with decoders, Aquamonix in Australia, who acquired the range of Tonick Watering products, offers a range of add-ons which can convert them to operate proven 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.  These latter can communicate with the controller using a simple ASCII protocol, or Modbus RTU slave.

Decoder-based watering systems have many advantages over satellite and multi-wire systems. Thanks to the quality of design and build embodied in Aquamonix and TWL 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
View Underhill Products
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