Indmar Marine Water Pump Circulation – 383 / 350 | Part #551045 Keep your freshwater cooling circuit flowing with this genuine Indmar water circulation pump for the 383 and 350 cubic inch marine engines. Unlike the raw water pump which draws water from outside the boat, the circulation pump moves coolant through the closed freshwater cooling circuit — maintaining even engine temperature across all operating conditions. Compatible with: Indmar 383 and 350 cubic inch marine engines