Material List item parts material 1 plastic cover plastic 2 handle aisi 304 3 thrust washer ptfe 4 packing ring aisi 304 5 stenm pavcking ptfe 6 seat ptfe 7 stem aisi 316 8 stenm nut aisi 304 9 ball astm-astm-a351 cf8m 10 cap aisi316 or astm-a351 cf8m 11 body astm-a351 cf8m