New NIRON brass valves with polypropylene adapters. Adapters can be made either in blue PPR or in grey PP-RCT. NIRON PPR is a complete polypropylene pipe and fitting system for the distribution of hot and cold water in plumbing and air conditioning systems. NIRON β PP-RCT is a system produced with a new generation material that uses a special β-nucleation process. The new formulation and production process of PP-RCT allows pipes produced with this material to perform at higher stress conditions and high temperatures.