{"product_id":"ashcroft-81377xll-pressure-gauge-2-5-in-30-0-15-psi-center-back","title":"Ashcroft 81377XLL Pressure Gauge 2.5 in 30-0-15 Psi Center Back","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ASHCROFT 81377XLL is a dual-scale analog pressure gauge designed to read both positive and negative pressure, spanning a range of 30 inches Hg vacuum through 0 to 15 psi. The stainless steel case and bronze wetted parts make it well suited to general industrial, HVAC, and plumbing service environments where corrosion resistance and long service life are priorities. The 2.5-inch dial provides a clear, readable face in panel or field installations. Accuracy is rated at 1 percent of full scale, meeting standard requirements for diagnostic and monitoring applications. The center back mount configuration allows direct pipe connection from behind, keeping the gauge face forward-facing and unobstructed.\u003c\/p\u003e\n\u003cp\u003eThis gauge is used in residential and light commercial HVAC systems, hydronic heating and cooling loops, plumbing systems, and compressed air or vacuum service lines. The compound pressure range makes it especially useful wherever technicians need to monitor both vacuum and low positive pressure in a single instrument. Center back mounting suits panel-mounted and manifold installations where side or lower-mount access is limited. Licensed HVAC technicians, plumbers, and pipefitters are the typical installers.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCompound pressure range: 30 inches Hg vacuum to 15 psi, readable on a single analog dial\u003c\/li\u003e\n  \u003cli\u003e1 percent of full-scale accuracy for reliable diagnostic and monitoring use\u003c\/li\u003e\n  \u003cli\u003eStainless steel case resists corrosion in wet or outdoor service environments\u003c\/li\u003e\n  \u003cli\u003eBronze wetted parts compatible with water, air, and many common system fluids\u003c\/li\u003e\n  \u003cli\u003e2.5-inch dial diameter for clear field readability\u003c\/li\u003e\n  \u003cli\u003eNon-liquid-filled design suits standard pressure monitoring without glycerin fill concerns\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation pressure gauge for residential and commercial HVAC, plumbing, and hydronic systems requiring a 1\/4-inch center back mount connection and a compound vacuum-to-positive pressure range.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is typically performed by a licensed HVAC technician, plumber, or pipefitter. Shut off and depressurize the system fully before removing an existing gauge or threading in this unit. Apply thread sealant tape or paste to the 1\/4-inch NPT threads per applicable plumbing or mechanical codes before installation. Do not use the gauge body as a wrench grip; apply torque at the hex fitting only to avoid case damage.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePressure Range\u003c\/strong\u003e: 30 inches Hg to 0 to 15 psi (compound)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAccuracy\u003c\/strong\u003e: 1 percent of full scale\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDial Diameter\u003c\/strong\u003e: 2.5 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDial Type\u003c\/strong\u003e: Analog\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMount Type\u003c\/strong\u003e: Center Back\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCase Material\u003c\/strong\u003e: Stainless Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWetted Parts Material\u003c\/strong\u003e: Bronze\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLiquid Filled\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.25 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: ASHCROFT\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 81377XLL\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ASHCROFT","offers":[{"title":"Default Title","offer_id":51539036012850,"sku":"81377XLL","price":203.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/b3bbea092f5b4780ca847ece6230fc4a_94c4056b-5022-4815-976c-d1319970e54e.jpg?v=1785833394","url":"https:\/\/voomisupply.com\/products\/ashcroft-81377xll-pressure-gauge-2-5-in-30-0-15-psi-center-back","provider":"Voomi Supply","version":"1.0","type":"link"}