{"product_id":"watflow-dn20-water-meter-3-4ft-npt-accurate-gallon-pulse-output","title":"Watflow DN20 Water Meter 3\/4ft NPT - Accurate Gallon Pulse Output","description":"\u003cp\u003eIn this review the Watflow DN20 water meter is examined for installers and facility managers who need a robust, accurate cold water flow instrument with pulse output. The single biggest reason to buy is its combination of a corrosion-resistant brass main case and reliable accuracy across a usable flow range, which makes it suitable for garden irrigation, small factory lines, or pulse-based monitoring systems. The review focuses on build, accuracy, installation, and the pulse output feature to show where this meter performs best.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion resistance:\u003c\/strong\u003e The main cases use an eco-brass alloy and materials selected for resistance to corrosion, which helps ensure long service life in outdoor or industrial settings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3\/4' NPT compatibility:\u003c\/strong\u003e Equipped with 3\/4' NPT couplings and calibrated in gallons, the meter fits common US plumbing and measurement setups without adapters in many applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccuracy across flow range:\u003c\/strong\u003e The meter maintains a maximum permissible error of about 1.5% in the normal flow range and about 3% at low flow, which is suitable for monitoring and billing-adjacent uses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePulse output:\u003c\/strong\u003e The built-in pulse output allows straightforward integration with remote counters or data loggers for automated monitoring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eServiceable inlet filter:\u003c\/strong\u003e The inlet filter is removable and cleanable without breaking the metrological seal, simplifying maintenance in dirty-water environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable design:\u003c\/strong\u003e The single-jet, magnetically driven register and composite body materials provide a simple, serviceable construction for routine use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe Watflow DN20 is aimed at small industrial users, installers, and homeowners who need a reliable cold water flow meter that reports in gallons and offers pulse output for automated monitoring. It is a practical choice for garden irrigation systems, small factory process lines, and situations where a clear pulse signal is required for remote monitoring.\u003c\/p\u003e\n\u003cp\u003eThose who need certified lead-free construction or a hot-water-specific meter should look elsewhere, since this model is specified as not lead-free and is described as suitable for cold water; for very low-flow precision metering under 0.25 GPM consider specialized laboratory-grade flowmeters.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolid build quality with eco-brass main case and corrosion-resistant wetted parts.\u003c\/li\u003e\n\u003cli\u003eGood accuracy for the price, with 1.5% error in normal flow ranges and usable low-flow performance.\u003c\/li\u003e\n\u003cli\u003eEasy installation with 3\/4' NPT couplings and a pulse output that integrates with loggers or counters.\u003c\/li\u003e\n\u003cli\u003eServiceable inlet filter that can be cleaned without breaking the metrological seal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNot specified as lead-free, so it may not meet all potable water regulations in some jurisdictions.\u003c\/li\u003e\n\u003cli\u003eDesigned for cold water; users needing certified hot-water performance should choose a different model.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeter size\u003c\/td\u003e\n\u003ctd\u003eDN20 (5\/8 x 3\/4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003e3\/4' NPT couplings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUnits\u003c\/td\u003e\n\u003ctd\u003eGallon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003eNormal flow 1.5%, Low flow 3%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlow range\u003c\/td\u003e\n\u003ctd\u003eMin 0.25 GPM, Continues 10 GPM, High 20 GPM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody material\u003c\/td\u003e\n\u003ctd\u003eEco-brass alloy with composite components\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput\u003c\/td\u003e\n\u003ctd\u003ePulse output for remote monitoring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Watflow DN20 is a pragmatic, value-oriented cold water meter that suits installers and small facilities needing an accurate gallon-based meter with pulse output. It trades premium certification for solid materials and serviceable design, making it a strong choice where corrosion resistance, ease of installation, and pulse monitoring are priorities.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this meter suitable for potable water?\u003c\/strong\u003e\u003cbr\u003eThe meter is made from eco-brass alloy and corrosion-resistant materials but is specified as not lead-free, so check local potable water regulations before use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I connect it to a data logger?\u003c\/strong\u003e\u003cbr\u003eYes, the meter includes a pulse output designed to interface with counters and data loggers for remote monitoring.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the minimum flow rate it measures reliably?\u003c\/strong\u003e\u003cbr\u003eThe minimum flow rate is 0.25 GPM, with a low-flow accuracy of about 3%.\u003c\/p\u003e","brand":"Watflow","offers":[{"title":"Default Title","offer_id":48651244863707,"sku":"B0D2M9XH9H","price":37.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61e_d4l2_wL._SL1500.jpg?v=1778612774","url":"https:\/\/gearmusthave.com\/products\/watflow-dn20-water-meter-3-4ft-npt-accurate-gallon-pulse-output","provider":"GearMustHave","version":"1.0","type":"link"}