Replacement Blades for Silicone Hose Cutting Tool, 10-pack 11141 The 16mm ID at one

The 16mm ID at one end and 13mm ID at the other end let you connect a 5/8" OD tube to a 1/2" OD tube

you are overdue for a new blade

These 90 degree reducer elbow hoses have a 19mm ID at one end and a 16mm ID at the other end to connect a 3/4" OD tube to a 5/8" OD tube

The correct clamp size will depend on the size of the tubing

It is designed specifically for connecting 2 1/2" (63mm) OD metal intake pipes

Replacement Blades for Silicone Hose Cutting Tool, 10-pack 11141 The 16mm ID at oneThese blades fit our Precision Silicone Hose Cutting Machine. The surgical quality steel holds an edge much longer than the average shop knife. Pack of 10 blades. (The complete cutting tool kit includes one pack of blades when new.) Note sure if it's time for a new blade? You should change the blade when cutting begins to require more effort. If you have to grip the hose so hard that you distort it as you turn, you are overdue for a new blade.