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Home – Steel Pipe Fittings – Pipe Cap – closure-type-decider Closure-Type Decider Buttweld cap vs socket-weld vs threaded vs blind flange — pick the closure that matches the service Will the end ever reopen? No — permanent closure Yes — needs routine access Pipe size NPS 4″ and below Above NPS 4″ Pressure / duty High pressure / cyclic / critical Low pressure / utility / instrument Internal service Clean / non-corrosive Corrosive / crevice-sensitive Calculate Recommended: Buttweld cap Get a closure spec for your line →