A hollow, cylindrical clutch adapter that surrounds a screw-on end cap and prevents the transfer of excessive torquing forces to the end cap so as to avoid over-tightening the end cap to a threaded neck of a fluid reservoir, such as that common to a squeeze bottle. The squeeze bottle includes an outer body that surrounds the fluid reservoir and a hollow head that surrounds the clutch adapter and is rotatable relative to the outer body. The clutch adapter includes a series of parallel aligned splines or teeth projecting radially inward thereof so as to be respectively interspersed between the usual ridges that are molded into the end cap, whereby to insure that a rotational force applied to the clutch adapter will be transmitted to the end cap. The hollow head is rotated to apply a corresponding rotational force to the end cap via the clutch adapter located therebetween. Once the end cap has been sufficiently tightened against the neck of the fluid reservoir, any further rotation of the head will cause the clutch adapter affixed thereto to slip and rotate around the end cap, such that excessive torquing forces that are applied to the head will be dissipated by the clutch adapter.