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HermitCrab Pro – Convert Existing Controller To Smart Irrigation Controller with 4G LTE

  • HermitCrab Pro converts your existing irrigation sprinkler controllers to a 4G LTE Capable Smart Irrigation controller powered by Jain Unity®.
  • Powered by Jain Unity ® that automatically adjusts landscape watering schedules by zone/station based on weather forecast, plant types, soil, micro-climate, and other environmental data.
  • “Plug and Play” installation in under 10 minutes.

Includes 1 Year Subscription to Jain Unity ®.

Made In USA 🇺🇸

Jain (old) SKU: 559122 Rivulis SKU 559122 Category

Product Description

ETwater’s patented retrofit technology can instantly convert an existing conventional controller into a smart controller. All the same features and functions from the ETwater SmartBox Controller are available now with the use of the ETwater HermitCrab Pro. 

HermitCrab Pro is compatible with most controller brands, most importantly the controller must have a remote control port. With the addition of a flow sensor you can measure, record flow and setup notifications in the event of a main line break or stuck valve. (Flow sensor sold separately and compatible with most available irrigation flow sensors.)


  • Great value: make your conventional controller “smart” for much less than the cost of a new smart controller.
  • With 20–50% water savings possible, payback can be just a few months.


  • “Plug and Play” installation in under 10 minutes.
  • Compatible with most major controller brands.


  • Remote monitoring + management via the web.
  • Single-platform simplicity allows management of multiple controllers of various brands at multiple sites—all with the JAIN Unity web-based system.
  • Includes the most popular labor-saving features of JAIN Unity online dashboard including water budgeting and rainfall forecast.
  • Flow Monitoring capability, with full reporting on learned flow rates per controller and per station.


Screen Shot 2021 07 27 at 4.45.27 PM

  • Self-adjusting weather-based watering schedules
  • Weather-proof, vandal resistant plastic NEMA 4X box and stainless steel hardware for mounting adjacent to existing controller
  • Back-lit display for viewing HermitCrab 2 operating status and programming selections.
  • Two-way wireless communication for downloading ET based schedules, reporting irrigation site data and sending alerts
  • Standard connection for rain sensors
  • 3 year Limited Warranty
  • Non-volatile Memory
  • Instant control and station watering from any device via QuickDraw
  • 3G/4G LTE network provides faster connections
  • HermitCrab 2 with Flow Monitoring measures / records flow and alerts on flow events such as main line breaks, lateral line breaks, stuck valves, and broken sprinkler
  • Diagnostic LED’s report on power and flow sensor status
  • EPA Watersense Certified
  • Dimensions 7.9” L x 3.9” W x 2” D
  • Weight 2 lbs
  • Input voltage 24 VAC provided by host controller
  • 3/4” Conduit Hole in center of controller bottom
  • Flow sensor sold separately

Additional Information

Include Flow Adapter?

Yes, No

Existing Controller Model

Hunter, Irritrol or Toro (RJ 11 connector), Irritrol or Superior (6 pin remote connector), Weathermatic (RJ11 connector), Rain Bird (5 pin remote connector), Rain Bird host controller (6 pin remote connector), Rain Master (9 pin D type male remote connector)


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