Optional PEEK cover to cover cups of DIN/SSA systemsSuitable for use with Anton Paar rotational viscometers Measuring System CC12 item NC1818606, CC18 item NC1818604, CC26 item NC1818602, CC12/D18 item NC1818608, SC4-18 item NC1818611, SC4-21 item NC1818613, SC4-27 item NC1818615, DG26 item NC1818619, DG26/SS NC1818621