If you are not familiar with 35.5 specifically, maybe another owner will join in. Pulled out old stock head today and getting ready to install new PH(Hi-Boy)II. Thanks for providing the link to Boatfix, you saved me over $50 and their service was great. Model specific question is in regard to hoses coming out of bulkhead behind head. Discharge and raw water intake are no problem. The old head had a hose running from pump cylinder through the bulkhead and back out to the bowl. That line wouldn't have a vented loop in it would it? Can't figure out why they would have run it through the bulkhead to begin with. I should be able to hook up discharge and raw water intake and GO, correct?