New NIRON PP-RCT coupler 28". Thanks to this new item, the product range is today even more complete to satisfy any installation requirement. NUPI fittings reach such large dimensions that Gaetano Dirocco from NUPI Quality department can easily jump into it in just one single athletic jump! Thanks to this new item, the product range is today even more complete to satisfy any installation requirement. The pipes and fittings that compose the NIRON PP-RCT range are produced using random copolymer polypropylene PP-RCT, a plastic material with a special molecular structure ensuring high mechanical resistance and duration, even at high temperatures and pressures.