91531-SZ5-003 Tube (3.5) Clip - Overview. The 91531-SZ5-003 Tube (3.5) Clip is a precise OEM component designed to secure 3.5mm diameter tubes in Honda marine engine systems. It plays a critical role in maintaining the integrity of your marine rigging and accessories by ensuring that tubing is firmly held in place. This reliable clip supports smooth operation by preventing tube movement that could cause wear or failures. Engineered to exact factory specifications, it ensures seamless integration