If Marine Sanitation installed it, they're a SeaLand/Dometic distributor/dealer...so I'd bet real money that the hose was SeaLand "OdorSafe," for which SeaLand charges an arm and a leg and claims is the most odor resistant hose on the planet...but definitely isn't! I've been on at least half a dozen boats on which it had failed, and heard about many more. It may be the only hose Marine Sanitation sells...if so, take your business to a dealer who carries Trident.