{"product_id":"value-collection-zmsch70438-o-ring-dash-438-nbr-70","title":"Value Collection ZMSCH70438 O-ring Dash 438 Nbr 70","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION ZMSCH70438 is a Dash 438 O-ring manufactured from Nitrile Butadiene Rubber (NBR), also known as Buna-N, one of the most widely used elastomers in fluid sealing applications. It features a round cross-section measuring 6.25 inches inside diameter, 6.75 inches outside diameter, and 0.25 inches thick. Rated at 70 durometer hardness, this O-ring provides reliable compression set resistance along with strong tear and abrasion resistance. It is suited for sealing applications involving petroleum-based fluids and operates across a temperature range of -40 degrees F to 250 degrees F. HVAC technicians, plumbers, and maintenance professionals commonly specify NBR O-rings for hydraulic, pneumatic, and fluid system sealing.\u003c\/p\u003e\n\u003cp\u003eThis O-ring is appropriate for use in residential and commercial systems where petroleum product compatibility is required. Typical applications include pump housings, valve bodies, pipe flanges, and hydraulic fittings where a large-diameter static or dynamic face seal is needed. The Dash 438 designation follows standard sizing conventions, making it a straightforward drop-in specification match when replacing worn or damaged seals in existing assemblies. Each package contains 2 O-rings. NBR material should not be stored in direct sunlight or near motors and other electrical equipment that may generate ozone, as ozone exposure degrades the elastomer.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eNitrile Butadiene Rubber (Buna-N) construction with excellent resistance to petroleum products\u003c\/li\u003e\n  \u003cli\u003e70 durometer hardness rating for reliable compression set and sealing force\u003c\/li\u003e\n  \u003cli\u003eOperates from -40 degrees F to 250 degrees F\u003c\/li\u003e\n  \u003cli\u003eRound cross-section geometry per standard Dash 438 sizing\u003c\/li\u003e\n  \u003cli\u003eStrong tear and abrasion resistance for demanding sealing environments\u003c\/li\u003e\n  \u003cli\u003eMeets SAE and MIL-Spec standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement O-ring for applications requiring a Dash 438 NBR seal compatible with petroleum products, hydraulic fluids, and similar media in plumbing, HVAC, and industrial fluid systems.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified technician familiar with the specific system being serviced. Depressurize and drain the system before removing the existing O-ring, and inspect the groove and mating surfaces for damage or contamination before fitting the new seal. Apply a compatible lubricant to the O-ring prior to installation to ease seating and reduce the risk of tearing. Avoid rolling or twisting the O-ring during installation to ensure proper seating and long-term sealing integrity.\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: 438\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 6.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 6.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.25 inches\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: 70 durometer (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 Media\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: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.02 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: ZMSCH70438\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51720161788210,"sku":"ZMSCH70438","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/64758be876fd57775e27447ca8de6525.jpg?v=1788561181","url":"https:\/\/voomisupply.com\/products\/value-collection-zmsch70438-o-ring-dash-438-nbr-70","provider":"Voomi Supply","version":"1.0","type":"link"}