Truco's range of hoses is classified by many differentiating factors, ranging from nominal bore sizes to working pressures.
Outer Diameter vs. Inner Diameter: 6 mm is the inner diameter (or the nominal bore) 8.8 mm is the outer diameter
S Size: The length and inside diameter?
T Temperature: Temperature of the medium transported?
A Application: What is the purpose of the hose?
M Material: What product will be conveyed through the hose?
P Pressure: The working pressure and the required safety margin?
E Ends: Are couplings required, and if so a detailed specification?
D Delivery: When is it needed?