Re: 55 RDE-17, 25 hp, Power Head O-rings, etc Home › Forum › Ask A Member › 55 RDE-17, 25 hp, Power Head O-rings, etc › Re: 55 RDE-17, 25 hp, Power Head O-rings, etc chris-pReplies: 2456Topics: 153 July 13, 2018 at 10:29 am #79477 Depends on seal orientation. More pressure can actually help a leaky seal hold.