corrode in an aqueous environment the flange 50 includes a central through bore 52 that is dimensioned to snugly receive the output shaft 22 more particular to the depicted embodiment the flange 50 includes a shoulder 54 that contacts the peripheral surface of the output shaft 22 the flange also includes a central counter bore 56 that receives a seal 58 and a rear counter bore 62 that is greater in diameter than the central counterbore the shoulder 54 and the seal 58 protect the internal components of the hydraulic motor 10 in addition to the seal 44 dust cover 46 and seal retainer 44 that are disposed in the front housing section 12 if desired the counter bores 56 and 62 can be filled with a lubricant e g oil to further protect the internal components of the hydraulic motor in such an instance the flange 50 may include an additional opening through which the lubricant can be introduced the hydraulic motor 10 includes a corrosion resistant coating 70 that in combination with the flange 50 and seals 44 and 58 protects the motor so that it can be used in a corrosive environment the flange 50 can act as a sealing.