consists of: gland, hull 1, per mil-b-24480 or astm-b-150 alloy C63Z00; sleeve, centrifugal casting 1, per qq-n-281 & astm-a-494, m-35-1; ring, upper 1, per mil-b-24480 or astm-b-150 alloy C63Z00; ring lower 1, per mil-b-24480 or astm-b-150 alloy C62Z00