Installing one today
on a H40.5 with 1 1/4 inch shaft and 2 1/2 inch stern tube. Cost was under $200. Hint: To remove the coupler from the shaft just remove the set screws and the coupler bolts, pull the shaft back a few inches, insert a deep socket smaller than the shaft diameter between the shaft end and the transmission coupling, using long bolts (or all tread and nuts) reconnect the shaft coupling to the transmission coupling, heat the coupling, cool the shaft, and start tighting the bolts one at a time, round and round the coupling until the shaft backs out. I really like the design of the PYI PSS shaft seal. For once a dry bilge!