Inline Filters are for use where space is limited, Replaceable filter elements, Heat Code Traceable to certified material test report, Variety of end configurations includesSEALEXCEL Well-lokTM Tube Fittings, Male NPT, BSPT, BSPT, BSPP pipe connections. Available Fractional Size : 18" to 12" Tube ODMetric Size : 3 mm to 12 mm Tube OD18" to 38" Pipe Thread.