Municipalities participating in interlocal agreements deemed a municipal employer subject to collective bargaining.

(b) Each employee organization, as defined in said section 7-467 , of the municipal employers constituting a municipal employer under this section shall retain representation rights for collective bargaining. If two or more employee organizations have representation rights, the employee organizations shall act in coalition for all collective bargaining purposes. (c) When a municipal employer is constituted under this section the collective bargaining agreement of each employee organization with representation rights shall remain in effect. A decision by a municipal employer to enter into or implement an interlocal agreement under sections 7-339a to 7-339 l , inclusive, shall not be a subject of collective bargaining but the impact of such agreement upon wages, hours and other conditions of employment, shall be a subject of collective bargaining.