08/26/2026
Lesson #4 is officially in session!
Raise your hand if youāve ever wonderedā¦
š āWhatās the difference between the blue cap and the yellow cap?ā
Hereās the easy way to remember it:
šµ Blue Cap = Neoprene Core
Think gas and petroleum. Neoprene is designed to handle oils, greases, waxes, fuels, and natural gas applications.
š” Yellow Cap = Nordel (EPDM) Core
Think water systems. Nordel excels in hot and cold water, hydronic systems, low-pressure steam, glycols, detergents, alcohols, and many water-based fluids.
š Peteyās Study Tip:
The cap color isnāt just for looksāit tells you whatās inside and helps you choose the right Peteās PlugĀ® for your application.
š Pop Quiz!
Which cap would you choose for a hydronic heating system?
šµ Blue
š” Yellow
Drop your answer below before the school bell rings! šš