Steel 2 1/2" NH / NST Dechlorinating Diffuser

Item Number: LPD-250
  • Steel 2 1/2" NH / NST Dechlorinating Diffuser
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$1,232.28
$1,232.28
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Ships: Sep 29, 2026

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NH / NST: The most common thread type in use by fire departments today is NST or National Standard Thread. NST also goes by the initials NH or National Hose. It can even be referred to as NHT or National Hose Thread but NST or NH is more common these days. NH = NST.

  • The female side of a NH / NST coupling will only connect to a male NH / NST connection
  • The male side of a NH / NST coupling will only connect to a female NH / NST connection
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Additional Details

The LPD-250 dechlorinating diffuser can handle flows from 200 to 1382 GPM and hydrant pressures up to 200 PSI. Widely used throughout the United States and Canada, the LPD-250 is the easiest dechlorination device available.

Simply fill the feed tube with tablets and the LPD-250 will do the rest. There is no chemical to mix and waste. The LPD-250 is for use with chemically treated (4 PPM or less chlorine/chloramine) potable water.

You can flush straight off a hydrant or attach a hose to point the flow where you want it to go.

The LPD-250 uses either LPD-Chlor tablets (contains Sodium Sulfite 81.3%) or Vita-D-Chlor Tablets (Ascorbic Acid-Vitamin C) which neutralizes the chlorine/chloramines in the water you are flushing.

When using LPD-CHLOR tablets, the LPD-250 consumes about 1 tablet per 2,500 gallons - the feed tube should be topped off with additional tablets after each increment of about 10,000 gallons of flow.

The LPD-Chlor tablets are specifically manufactured for use in the LPD without the need for a tablet screen. The diffuser can handle about 10,000 gallons between tablet recharge.

Specifications

  • Steel Body Construction
  • Dechlorinate up to 4 PPM
  • Traps Debris
  • Diffuses Discharge
  • Neutralizes Chlorine and Chloramine in Potable Water
  • Visual Table Consumption
  • Use LPD-CHLOR Tablets
  • No Tablet Screen Necessary
  • 2 1/2 inch Swivel Female NH / NST Fire Thread Fitting
  • 19 1/2” L x 8 1/2” W x 11 1/2” H
  • 11 Tablet Capacity: Uses approximately 1 Tablet per 2,500 gallons
  • To be used with 81% LPD-Chlor (Sodium Sulfite) Tablets: no tablet screen necessary for use with the LPD-Chlor (W0000010) tablets

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