Extremely flexible hose with crystal clear vinyl tube. FDA approved compounds. For potable water fill, sink, bilge pump, shower, icebox and livewell drains (above the water line). FDA approved clear vinyl supported by a rigid black vinyl helix. Extremely flexible. Couplings: Use Series 147 right hand thread cuffs. Not recommended for sanitation use or through hull drains below the water line. 141 SERIES.