T-H Marine HYDRA Automatic Bilge Pump - 1100 GPH - 12V [PMP-BLGA11-DP]HYDRA Automatic Bilge Pump 1100 GPH 12V The T H Marine HYDRA Automatic Bilge Pump is engineered for reliable, high performance water removal with long term durability built in. Backed by 4,000 hours of testing, HYDRA delivers dependable operation through its advanced anti airlock design, ensuring reliable restarts even when air is present in the line. A precision balanced motor with a 316 stainless steel motor shaft reduces vibration, noise, and