{"product_id":"value-collection-zmsch90344-o-ring-dash-344-nbr-90-duro-25pk","title":"Value Collection ZMSCH90344 O-ring Dash 344 Nbr 90 Duro 25pk","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION ZMSCH90344 is a Dash 344 Nitrile Butadiene Rubber (NBR\/Buna-N) O-ring rated at 90 durometer for extra-hard sealing applications. It measures 3.875 inches inside diameter, 4.25 inches outside diameter, and 0.1875 inches thick with a round cross section. Rated for continuous service from -40 to 250 degrees F, this O-ring is engineered for strong resistance to petroleum-based fluids, making it a dependable choice in hydraulic, pneumatic, and fluid-handling assemblies. HVAC technicians, plumbers, and industrial mechanics regularly specify Buna-N seals at this hardness for high-compression, oil-exposed connection points. Each package contains 25 pieces. Meets SAE and MIL-Spec standards.\u003c\/p\u003e\n\u003cp\u003eThis O-ring is appropriate for residential and commercial applications wherever a Dash 344 NBR seal is called out, including pump housings, valve bodies, pipe flanges, filter housings, and refrigeration service fittings that contact petroleum products. The 90-durometer rating provides extra hardness suited to high-pressure connections with tight tolerances. Its temperature range covers most HVAC and plumbing operating conditions without seal degradation. Compatible with petroleum products; not suitable for contact with ozone, sunlight exposure during storage, or environments that generate ozone from motors or electrical equipment.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eBuna-N (NBR) elastomer — excellent resistance to petroleum-based fluids and lubricants\u003c\/li\u003e\n  \u003cli\u003e90 durometer (extra-hard) for high-compression sealing at tight-tolerance joints\u003c\/li\u003e\n  \u003cli\u003eOperating range of -40 to 250 degrees F for broad HVAC and plumbing serviceability\u003c\/li\u003e\n  \u003cli\u003eRound cross section, 0.1875 inches thick — conforms to Dash 344 industry sizing\u003c\/li\u003e\n  \u003cli\u003eMeets SAE and MIL-Spec standards\u003c\/li\u003e\n  \u003cli\u003eSold in a package of 25 pieces to support service stock and multi-unit jobs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a Dash 344 O-ring replacement for any assembly specifying a 3.875-inch ID, 4.25-inch OD, 0.1875-inch-thick NBR seal. Compatible with petroleum products. Not recommended for use with ozone-generating environments or prolonged direct sunlight exposure during storage.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is typically performed by licensed HVAC technicians, plumbers, or industrial mechanics. Always depressurize and isolate the system before removing the existing seal and seating the replacement O-ring. Inspect the groove and mating surfaces for nicks or corrosion that could cause leakage, and apply a compatible lubricant to the O-ring before installation to prevent rolling or tearing during assembly. Do not store Buna-N O-rings near motors, ozone-generating equipment, or in direct sunlight, as ozone and UV exposure accelerate elastomer degradation.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Nitrile Butadiene Rubber (Buna-N)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDash Number\u003c\/strong\u003e: 344\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 3.875 inches (97.79 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 4.25 inches (107.95 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.1875 inches (5.33 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCross Section Shape\u003c\/strong\u003e: Round\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHardness\u003c\/strong\u003e: 90 Durometer (Extra Hard)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Working Temperature\u003c\/strong\u003e: -40 degrees F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Working Temperature\u003c\/strong\u003e: 250 degrees F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Fluids\u003c\/strong\u003e: Petroleum Products\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor\u003c\/strong\u003e: Black\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: SAE, MIL-Spec\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFDA Approved\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 25 pieces\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 2.36 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: VALUE COLLECTION\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: ZMSCH90344\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51700091027762,"sku":"ZMSCH90344","price":21.33,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/e63e5be40384736fb1f090e4d0cdd585_3548842e-f09f-4b5e-ac63-39497ccd8184.jpg?v=1788385899","url":"https:\/\/voomisupply.com\/products\/value-collection-zmsch90344-o-ring-dash-344-nbr-90-duro-25pk","provider":"Voomi Supply","version":"1.0","type":"link"}