The ST200 has been discontinued since mid-2000. It used a housing with a 1 11/16" OD. The speed/temperature insert is held in place by a clevis pin through the threaded portion of the housing.
A side-lobe paddlewheel was initially available but is now discontinued. The current 33-114 paddlewheel can be used as a replacement part.
The ST200 transducers did not use valve housings or valve sleeves.