O-Ring, Compatible with Grainger Part Number 6PY37A, 6PY38A, 6PY40A, 6PY41A, 6PY52A, 6PY53A, 6PY54A, 6PY55A, Compatible with Manufacturer Model Number NDP-20BAT, NDP-20BPT, NDP-20BST, NDP-25BAT, NDP-25BPT, NDP-25BST, NDP-5FDT, NDP-5FPT, Product Type O-Ring, Compatible with Brand Dayton.