Housings in the food industry are used for a variety of things including beverages, and in large scale food production factories for filtering.
The materials used for housings have to adhere to high safety standards so that the food is safe for consumption, which makes stainless steel the perfect material for them to be produced in, as it has antibacterial properties as well as non-reactivity with acidic foods and beverages.
Stainless Steel housings are also required where bearings are used in the production process, to give protection to the bearings from the harsh processed involved in food productions.