ArmaFlex Fastlink DN25 G1¼" Internal Thread Coupling – SO-SDN25-I11/4 The SO-SDN25-I11/4 is an Armacell Fastlink coupling for connecting DN25 pre-insulated heat pump pipe to a compatible male-threaded port. It has a G 1¼" BSP internal thread and is designed for the Fastlink metallic-sealing connection system. Key Features G 1¼" BSP internal thread — for compatible male-threaded heat pump and pipework connections. DN25 Fastlink system fitting — compatible with Fastlink DN25 standard sets and the DN25 25m coil. Metallic-sealing connection — designed for the Fastlink quick-connect system. Sold individually — manufacturer pack quantity is 4 pieces per bag; the Pipelagging price is per piece. Compatible With ArmaFlex Fastlink Pre-Insulated Heat Pump Pipe Sets – DN25 & DN32 ArmaFlex Fastlink DN25 25m Double Pipe Coil Supply Available to order — delivery on request. Lead times apply. Contact the Pipelagging technical team to confirm availability before ordering. Specification SKU: SO-SDN25-I11/4 Nominal size: DN25 Thread: G 1¼" BSP internal Manufacturer pack quantity: 4 per bag Sold as: Individual piece Compatible system: ArmaFlex Fastlink pre-insulated heat pump pipe Vendor: Armacell