Expansion Valve 1/4 M Gruppo Izzo 66mm over all length with a 23mm diameter at the wider point 23mm widest diameter with a 1/4 Male BSP fitting and the side one of 1/8F BSP Fits the following Izzo models: Alex-Duetto (201405-) Alex-Duetto-Evo Alex-Duetto-IV-Plus Alex-PID (201707-) Valexia-Duetto (201701-) Valexia-PID (201707-) You might also need: Teflon Gasket Kilinger Gasket Copper Gasket