Replace old-style mercury float switches with this proven rolling ball design.Features a mercury-free, rolling-ball mechanism with an exclusive anti-spike feature to prevent the rapid on/off cycling encountered with some switches. Safer than mercury switches. Rugged thermoplastic construction.Key FeaturesMercury-free design won't harm environmentProven hinged float, rolling ball designAnti-spike feature prevents rapid on/off cyclingSpecifications Activation Method: Rolling metal ball Capacity: 15A Dimensions: 2-1/2"H x 3"W x 4-1/2"L Warranty: Three years