Overfill-prevention valve system (20) for a storage tank (94) including a testing mechanism (200), operable by a user from the inlet end 880) of a drop tube (98), which can be used to verify proper valve (34) function without actually filling the tank. The testing mechanism allows the user to actuate the valve (34) manually using a test probe (206), e.g. by elevating a float (36) to simulate a full storage tank. The testing mechanism may be located upstream of the valve to facilitate the testing operation without interfering with the valve body. The mechanism may provide non-contact functionality, such as with magnetic actuators (42, 44) on either side of the drop tube wall, to eliminate a potential test mechanism leak points. The test probe (206) for actuating the test mechanism may be shaped to define a desired rotational position at the test location within the drop tube, ensuring rotational alignment of the magnetic actuators.
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