It corresponds to part number 19 in the exploded view of the cooling system.

OEM Equipment for the following engine models (and the boat that we are aware used these engines... There could be other combinations as well):
• M-18 (Catalina 27, Catalina 30)
• M-25 (Catalina 30)
• M-25XP (Catalina 28, Catalina 30, Catalina 34, Catalina 36)

Includes hose clamps.

• Inside diameter: 7/8"
• Length: 7"

When looking in archival Universal parts books for these engines we have found this particular hose called out in several locations. In some books, even when listed for the same engine, there have been different Universal part numbers called out for the same hose. Please verify that the length called out in the dimensions tab matches the length of hose you are replacing. 300101 300816