Parker fittings for tubing are constructed with materials that are FDA compliant and are NSF-51 listed as safe for use and contact with food.Gray acetal TrueSeal Parker fittings meet NSF-61 requirements for drinking water (potable water) system components. All Parker True Seal fittings are plastic body design that offers reduced weight eliminate rust, corrosion, and system contamination in applications where metal components cannot be tolerated.