Any beneficiary of a retirement allowance payable for service or disability under the provisions of chapter 41.40 RCW may, in the manner provided for by WAC 415-108-430, authorize the director to deduct therefrom, on a monthly basis only, such amounts as are due as premiums on any group life or disability insurance policy or plan currently covering the beneficiary, issued to the employer by which he was employed prior to his retirement for the benefit of a group comprised of himself and his fellow public employees, under authority granted to the employer by act of the Washington legislature. The department and the director are not and will not be liable for any failure to make such deduction payments on time or in the proper amount.