The "food grade" part is up for debate. I would call it "food safe" below is a cut and paste from a chemical company that makes Ryton:
Do you have any "FDA approved" grades of RytonŽ PPS?
Answer: There currently are no "U.S. FDA approved" RytonŽ PPS injection molding compounds. In accordance with U.S. FDA Food Contact Notification (FCN) 1083, all RytonŽ PPS production polymers may be used as components in the manufacture of food-contact articles for repeat-use food-contact applications, in contact with all types of food, under Conditions of Use A-H, and J. Polyphenylene sulfide resins are also specifically permitted under 21 CFR 177.2490 as coatings or components of coatings of articles intended for repeated food contact use, subject to certain limitations. These permissions do not extend to articles injection molded from RytonŽ PPS injection molding compounds. But, ordinary houseware articles, such as dishes, flatware, beverage glasses, mugs, cooking utensils, cutlery, and electrical appliances, are not subject to U.S. FDA regulation as "food additives." Therefore RytonŽ PPS injection molding compounds may be suitable for use in such articles classified as housewares, but such use is subject to the general safety provisions of the U.S. Food, Drug and Cosmetic Act, meaning their use cannot in any way adulterate the food contacted. It is the responsibility of the manufacturer of the final article to determine the safety and suitability of RytonŽ PPS for such applications. Several RytonŽ PPS injection molding compounds have been certified to comply with the requirements of various Potable Water and Food Contact Standards.
---It is a pump. It is cheap. And it does look like the topsflo. The diagram and specs however are from: