Midas brand and stock Type 50 stationary multi-spring seal, to suit Inoxpa Prolac "S-" series pumps, with single or tandem seal arrangements. With stationary seals like the Type 50, the coils are on the stationary and the rotary is a counter-ring. Pumps with flushed seal chambers use tandem seals, with the Vulcan Type 50 in the impellar position, and a standard Vulcan Type 1688 in the outer flush water position.
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