/s/ Michael J. Yates

Your annual base salary will be $185,000, payable on a biweekly basis at the rate of $7,115.39 per pay period. You will be eligible for a review of your salary with consideration for an increase on January 1, 2006. While we hope that you have a long and mutually beneficial relationship with IDEX, your employment will not be for any fixed term or definite period and may be terminated at any time.

You will be eligible for participation in our Management Incentive Compensation Plan (MICP), which provides an annual incentive earnings opportunity based on company and personal performance. You will be placed in Salary Range 22 with a target level of incentive compensation of 50% of your annual base pay in effect at the beginning of the plan year. The actual payout under the plan could be from 0% to 130% of base salary depending upon the performance of IDEX and your individual performance. In addition, we will guarantee that your prorata 2005 MICP award will be no less than $30,000.

You will be eligible for the full range of benefits for IDEX employees at the Northbrook headquarters, including the IDEX Defined Contribution Retirement Plan, IDEX Corporation Supplemental Executive Retirement Plan (benefits in excess of the IRS limits for qualified retirement plans), 401(k) IDEX Savings Plan, medical and dental coverage, short-term and long-term disability coverage, life insurance, and enhanced one million-dollar business travel accident coverage. A ChoiceComp folder describing our flexible benefit plan is enclosed. You will be eligible for medical coverage on the first of the month following your employment date.

Subject to approval of our Board of Directors, we expect to award you annual equity grants under the IDEX Incentive Award Plan. This plan is designed to provide an incentive and reward to key employees who are in a position to make substantial contributions to the success of the company. A combination of stock options and restricted stock is normally awarded to Officers at the Annual Shareholders’ Meeting in March.

For the March 2006 grant, we will recommend to the Board of Directors that you shall receive the equivalent of a minimum of 12,000 stock options, which approximates $150,000 in expected value, with a portion delivered in restricted stock at a conversion rate of approximately 3 to 1.

Effective January 1, 2006, you will be eligible to participate in the IDEX Deferred Compensation Plan for Officers, which provides an alternative to defer income and subsequent earnings on that income until after retirement.

As an IDEX officer, you are eligible to use a company-provided car under the IDEX Car Policy with a target value of $34,000 including tax, title, and license. You will be subject to taxable income for the personal use of this car under current IRS regulations. We will assist you to place the order through Wheels, Inc., which supplies our company cars. Alternatively, you may opt for a car allowance of $900 per month, if you prefer.

You will be eligible for three (3) weeks of vacation annually. Additionally, the IDEX Holiday schedule typically contains 14 paid holidays, which include a shutdown period during the December holiday season.

As a special sign-on incentive, an initial equity grant will be awarded to you on your start date in the amount of 1,500 shares of restricted stock and 5,000 stock options. The initial price at which the options are granted will be the fair market value on the day immediately prior to the effective date of the grant. Option vesting will occur ratably over four years; restricted shares will cliff vest on the fourth anniversary of the grant.

A one-time signing bonus of $20,000, less appropriate deductions for taxes, will be payable within 30 days of employment. Should you voluntarily terminate your employment from IDEX within 12 months of your hire, you will be required to repay this amount in full.

As discussed with you, we expect that IDEX will continue to grow and prosper as an independent publicly-owned company. However, in the event of a “Change in Control,” as defined in the 2005 Incentive Award Plan, that results in your termination from service within 24 months of the Change in Control, the Company would be obligated to pay your salary at the rate then in effect and your then current target MICP bonus for a minimum of 24 months following the date of termination. This payment would not be applicable in the event of your resignation.

/s/ Michael J. Yates

9/21/05

ChoiceComp Benefits Booklet

IDEX 401 (k) Plan Summary

Ethics policy

Ethics acknowledgement form

Confidentiality Agreement