OEM Equipment for the following engine models (and the boats that we are aware used these engine... There could be other combinations as well):
• M-25XPB (Catalina 28 MkII, Catalina 30 MkIII, Catilina 310)
• M-35B (Catalina 34 MkII, Catalina 350, Catalina 36 MkII)

• Inside diameter: 1-1/8"
• Overall length: sold by the inch, minimum order of 6" required

There is one flaw in our plan for this hose... Prior to March 1998 Universal supplied a specially molded coolant hose to connect the thermostat to the manifold on the M-25XPB and M-35B engines. The factory discontinued use of the molded hose in March of 1998. They now use instead approximately 6" length of this 1-1/8" hose.