This hose is very similar to the familiar, white, Series 148 sanitation hose except for 2 characteristics it is light gray in color, and it is not rated for carrying potable water. Otherwise it has the same heavy wall, flexibility, and odor permeation resistance characteristics.

Extra heavy-duty marine sanitary hose - smooth gray vinyl
Specially compounded to provide excellent resistance to odor permeation
Applicable for critical bilge, drain scuppers, live wells, etc.
Hard PVC helix gives good flexibility and bend radius; no cuffs required
Don't use with alcohols, anti-freeze, petro-chemicals or solvents