EXHIBIT 23

                         CONSENT OF INDEPENDENT AUDITORS

We consent to the incorporation by reference in this Annual Report (Form 10-K)
of CUNO Incorporated ("CUNO") of our report dated December 11, 2003, included in
the 2003 Annual Report to Shareholders of CUNO.

Our audits also included the financial statement schedule of CUNO listed in Item
14(a). This schedule is the responsibility of the Company's management. Our
responsibility is to express an opinion based on our audits. In our opinion, the
financial statement schedule referred to above, when considered in relation to
the basic financial statements taken as a whole, presents fairly in all material
respects the information set forth therein.

We also consent to the incorporation by reference in the Registration Statement
(Form S-8 No. 333-39763) pertaining to the CUNO Incorporated 1996 Stock
Incentive Plan, the CUNO Incorporated Non-Employee Directors' Stock Option Plan,
and the CUNO Incorporated Savings and Retirement Plan and the registration
statement (Form S-8 No. 333-54388) pertaining to the CUNO Incorporated 1996
Stock Incentive Plan and the CUNO Incorporated Non-employee Directors' Stock
Option Plan of our report dated December 11, 2003, with respect to the
consolidated financial statements incorporated herein by reference, and our
report included in the preceding paragraph with respect to the financial
statement schedule included in this Annual Report (Form 10-K) of CUNO.

/s/ Ernst & Young LLP

Hartford, Connecticut
December 17, 2003