{"product_id":"best-welds-900-98w18-o-ring-tig-torch-back-cap","title":"Best Welds 900-98w18 O-ring Tig Torch Back Cap","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe BEST WELDS 900-98w18 is a replacement O-ring designed for use with TIG welding torches and back caps. O-rings in TIG torch assemblies create the gas-tight seal between the back cap and torch body, preventing argon or helium shielding gas from escaping at the rear of the torch. A failed or worn O-ring results in shielding gas loss, inconsistent arc starts, and potential weld contamination. This part is a direct replacement component intended for installation by welding equipment technicians or experienced welding professionals performing routine torch maintenance.\u003c\/p\u003e\u003cp\u003eThis O-ring is compatible with the 17, 18, and 26 series TIG torch bodies, as well as the 300M back cap and 57Y02 and 57Y04 back caps. These torch series are widely used in both light industrial and professional shop environments for GTAW (TIG) welding on steel, stainless steel, and aluminum. It is a consumable maintenance item typically replaced during torch inspections or when shielding gas leaks are detected at the back cap.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSeals the back cap-to-torch body interface to prevent shielding gas leakage\u003c\/li\u003e\n\u003cli\u003eCompatible with 17, 18, and 26 series TIG torch bodies\u003c\/li\u003e\n\u003cli\u003eFits 300M, 57Y02, and 57Y04 back caps\u003c\/li\u003e\n\u003cli\u003eRoutine consumable for preventive torch maintenance\u003c\/li\u003e\n\u003cli\u003eDirect OEM-style replacement fit\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eCompatible with 17, 18, and 26 series TIG torches, and fits 300M, 57Y02, and 57Y04 back caps as stated by the manufacturer.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by welding equipment technicians during routine torch servicing or troubleshooting of shielding gas leaks. Before replacing the O-ring, turn off the shielding gas supply at the regulator and ensure the torch is disconnected from the power source. Inspect the back cap seating surface for scoring or debris before installing the new O-ring. Do not use petroleum-based lubricants on O-rings in gas-service applications unless specifically approved for that use.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type\u003c\/strong\u003e: O-Ring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: TIG Torch Back Cap Seal\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: BEST WELDS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 900-98w18\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BEST WELDS","offers":[{"title":"Default Title","offer_id":51525263425842,"sku":"900-98W18","price":14.99,"currency_code":"USD","in_stock":false}],"url":"https:\/\/voomisupply.com\/products\/best-welds-900-98w18-o-ring-tig-torch-back-cap","provider":"Voomi Supply","version":"1.0","type":"link"}