I replaced mine using "Trident" brand corrugated bilge hose through Defender.com in Waterford, CT. It's 1 1/2" (their stock code# 500624), a barbed nyon "T" and double clamped each connection (Stainless clamps). See picture attached. Basically, I just duplicated the OEM installation. It's a real pain to get access...I had to remove the port quarter berth bulkhead, then crawl back through the berth into the open lazarette laying on my side...with the aid of some cushioning as you'll be there for a while in an awkward position.
Some say that the original configuration is prone to freeze damage as water collects in the "trap" section, but should not be a problem if before you wrap it up for the offseason you: 1) pour RV antifreeze down both cockpit scuppers until it dribbles out the stern drain, or 2) use a shop vac or compressed air and blow out the lines, or 3) don't do it like OEM and me and make your connections shorter from the cockpit drains to the "T" (or "Y") as well as the "T" (or "Y") to the common drain. You'll lose your "trap"; I'm not sure if that's good, bad or indifferent.
