Straight thermostatic valve with female connection. Connection to iron pipe x Connection to radiator: G 3/8"F x G 3/8"M with or without O-ring (with white protective cap or manual head), G 1/2"F x G 1/2"M with or without O-ring (with white protective cap or manual head), G 3/4"F x G 3/4"M with or without O-ring (with white protective cap or manual head), G 1"F x G 1"M with or without O-ring (with white protective cap), G 1"1/4F x G 1"1/4M with or without O-ring (with white protective cap). Flow rate pre-regulation only available for 3/8", 1/2" and 3/4" sizes: N-series (black protective cap or white manual head) or F-series (red protective cap or white manual head). Ring nut with spingle which can be replaced and inspected while the system is working. Fluid: water, glycol-water solutions (up to 30% glycol max). Max fluid temperature: 120° C. Max operating pressure: 10 bar. Max differential pressure: 1 bar. Max differential pressure with thermostatic head installed: 0.25 bar. Body material: nickel-plated CW617N brass. Gaskets and O-rings materials: peroxide EPDM. Spring, washer and spindle material: stainless steel. Protective cap and manual head material: ABS.