Because it is a type of plastic
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Johnson 01-46798-2 Wear Plate for Johnson F7B Pumps Lines & Braid-Braid Because it is a typeSPX Johnson stainless steel replacement wear plate, suitable for Johnson F7B multipurpose, bilge and deck wash impeller pumps, including: F7B 5001 pumps (10 24577 13 & 10 24577 99), F7B 5001 MC pumps (10 24578 03) F7B 50017 pumps (10 24577 19 & 10 24577 98), F7B 50017 MC pumps (10 24578 04) F7B 8 pumps (10 24572 01, 10 24572 13, 10 24572 53, 10 24572 54, 10 24630 01, 10 24637 01, 10 24666 01, 10 24667 01 & 10 24753 01) F7B 803 pumps (10 24572 05 & 10