BACFREE BigBoy Top-up Valve ø50mm Rainwater Harvesting System
Price RM1,500.00
Product SKU BB50MM
Size (L x W x H) 12 cm x 36 cm x 12 cm
Availability In Stock
  • Model: BigBoy Valve 50mm
  • Model code: BB50MM
  • Material Body: Medium Viscosity Polymer
  • Material String: Food-grade
  • Inlet(mm): ø50mm
  • Flow rate (L/Min): 800
  • Working pressure (PSI): 8 – 175
  • Country of origin: New Zealand

Rainwater harvesting systems allow us to achieve a sustainable future with a better environment. Collected and filtered rainwater can be safely used for e.g.:
1) Toilet Flushing & Urinals
2) Irrigation
3) Laundry Washing
4) Vehicle Washing & General Cleaning
5) Livestock Breeding & Farming
6) Industrial & Commercial Application



  • - Apply in rainwater tank and domestic water tank
  • - Back-up source from municipal water supply
  • - Fully mechanical – no energy consumption
  • - Variable adjustment of min. water level
  • - Diaphragm activated – full flow valve
  • - Soft closing – no water hammering
  • - Patented self-cleaning mechanism to minimize blockage
  • - Standard's approved for mains water connection
  • - Maintains regulatory “air-gap” – separate rainwater from municipal water supply
  • - Rainwater fills tank at the next rainfall

When Substituting municipal water with rainwater for non-potable usage the amount of municipal water used can decrease by UP TO 50% and by this, the water bill is reduced greatly with the usage of rainwater. Moreover, a rainwater harvesting system is a good form of water supply during water rationing or interruption of water supply. By harvesting rainwater, chances flash floor are reduced as rainwater run-off and thus the system can be formed as part of the rainwater management scheme.


Why using 4-Step Rainwater Harvesting System?

The BACFREE WISY 4-Step Rainwater Harvesting System ensures that your rainwater is clean enough to store. By using the 4-step system you will:

  • Reduce the amount of particulates that enters the rainwater tank and as a result
  • Prolong the life of your pump and filtration equipment
  • Oxygenate the water to inhibit growth of anaerobic bacteria
  • Create a higher and better water quality for your system
  • Ensure a calmed inflow and distribution of the water without re-suspending sediments
  • Prevent formation of a surface barrier layer and therefore ensure optimum exchange of oxygen between air and water
  • Extract clean rainwater from the cleanest water layer
  • Eliminate the need to clean debris from your tank
  • Minimize system maintenance due to unique pre-filtration technique


Water Is Our Passion

  • We provide our customer with Innovative and Sustainable Water Solutions.

  • Continuously, we are adopting Industry Best Pratices to ensure Operational Excellence.

  • We improve the well-being of our employees through Continuous Talent Development.



  • Valve must be installed horizontally

  • Do NOT install on an angle

  • Do NOT restrict inlet water flow

  • NOT to be modified

  • NOT to be used in dual purpose tanks used for storm-water detention

  • Overflow and air-gap to comply with local standards (air-gap of 55mm complies with AS/NZS 3500.1)

  • Do NOT restrict inlet water flow

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  • BigBoy Top-up Valve x 1