Jaison_Water_Tap
The Jaison Water Tap or Jayson Water Tap (also known as Waste Not Water Tap) is a self-closing water-saving tap[1] invented in the early 20th century [2] by J.P. Subramonya Iyer at Travancore, South India. These taps were a common sight on the roads in erstwhile Travancore, part of modern-day Kerala state in South India. They are quite popular throughout the Indian sub-continent and can still be commonly found in most of the traditional railway stations operated by Indian Railways.
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The Jaison water tap is an excellent example of commercialized grass roots innovation from modern India, that went far beyond what is typically termed Jugaad or life hack. Its production was an economic activity that created wealth and helped solve the problem of water wastage in public water taps and thus brought significant benefits to the Indian society.