Whale Smartbail bilge pumps allow manual hand or foot operation. Simple diaphragm construction. A great backup, manual pumps continue to operate in emergency situations when onboard electrical systems have shut down.
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Bilge Pump - Manual
Used the pump very little. Each time it was used the hinge showed signs of being overworked. Plastic handle which doubles as a cover plate cracked where it attached to the diaphragm. The dovetail plastic insert pulls out of the handle. Useless. Clearly a bad design. Failed when I needed it. Customer service wouldn't even give me the address to ship it to for repair.
After one season of moderate use the diaphragm developed a leak on one of the folds that are created from operating the pump. The service kit is hard to get and expensive. Even when it's functional it doesn't have a smooth even stroke. The low profile concept is appealing but the design needs work. Not recommended.