{"product_id":"armstrong-975000-984-1-5-8-type-21-seal-kit","title":"Armstrong 975000-984 1-5\/8\" Type 21 Seal Kit","description":"\u003cp\u003eMaintain the integrity of your hydronic pump assemblies with the \u003cb\u003eArmstrong 975000-984\u003c\/b\u003e, a precision-engineered 1-5\/8\" Type 21 seal kit. Designed for demanding HVAC environments, this kit provides an essential barrier against fluid leakage, ensuring your circulation systems continue to operate at peak efficiency without costly downtime or pressure losses.\u003c\/p\u003e\u003cp\u003eThe Type 21 mechanical seal functions by utilizing a rotating face and stationary seat that maintain constant contact, effectively sealing the shaft against fluid egress. This design is highly resistant to heat and friction, providing long-term reliability in high-cycle pumping applications common in large-scale commercial hydronic loops.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eSeal Integrity:\u003c\/b\u003e Precision-machined surfaces to minimize weepage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThermal Resilience:\u003c\/b\u003e Engineered to withstand standard system operating temperatures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDurability:\u003c\/b\u003e High-grade material composition for extended service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCompatibility:\u003c\/b\u003e Specifically calibrated for Armstrong 1-5\/8\" shaft requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for commercial HVAC circulation pumps, building water management systems, and hydronic heating\/cooling loops requiring standardized mechanical seal replacement.\u003c\/p\u003e","brand":"Armstrong","offers":[{"title":"Default Title","offer_id":43134693441630,"sku":"975000-984","price":334.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/975000_984_image_23ae5ba2-9d29-4efe-84e1-50198f9751ed.jpg?v=1786110707","url":"https:\/\/nationalboilersupply.com\/products\/armstrong-975000-984-1-5-8-type-21-seal-kit","provider":"National Boiler Supply","version":"1.0","type":"link"}