Rotating seals for cell processing systems

A seal apparatus comprising:

• a body comprising a first portion and a second portion, wherein an axially aligned first opening acting as a first port is positioned through the first portion and the second portion, and wherein the first portion includes a recess and a second opening acting as a second port positioned adjacent and parallel to the first port opening;
• a first annular rotating seal member positioned within the recess, the first annular rotating seal member having a non-sealing face, and a sealing face which defines a plurality of concentrically spaced annular sealing surfaces having an annular space therebetween, the member further defining an axial opening, and
• a second annular rotating seal member having a non-sealing face, and a sealing face which defines at least one annular sealing surface, the member further defining an axial opening, wherein
• the first annular rotating seal member and the second annular rotating seal member are axially aligned,
• the annular sealing surfaces of the first annular rotating seal member and the second annular rotating seal member are placed in contact to form a plurality of spaced apart seals, and
• at least one of the non-sealing faces of the first annular rotating seal member and the second annular rotating seal member define a channel in gaseous communication with said annular space and with the second opening of the first portion of the body.