Humminbird XPTH-9-20-MSI-T Mega SI Plastic Thru HullThe Humminbird XPTH 9 20 MSI T Mega SI Plastic Thru Hull transducer delivers ultra clear Mega SI sonar in a durable plastic thru hull package, engineered for serious anglers who demand precise bottom tracking and strong target separation. Through hull design: Rugged plastic transducer engineered for reliable thru hull installation and smooth hull interaction with low drag. Mega SI imaging: High contrast, detailed sonar images with beams at 20, 60, 86,