15mm with a 10mm Reducing kit included. (10mm Reducing Kit). Simple Installation. Adjustable Tail Piece.
Warmehaus Thermostatic Radiator Valve 15mm x 1/2" Angled White Chrome Rad TRV + Lockshield
Gold Contract 15mm Angled Full Chrome TRV Thermostatic Radiator Valve 15mm x 1/2
Elite TRV Radiator Valve 15mm x 1/2" Straight Chrome Plated Head.
Thermostatic Radiator Valve 15mm & 10mm x 1/2" Angled White Chrome Rad TRV
RadiLux Angled White Chrome Thermostatic Radiator Valve 15mm TRV Rad
Thermostatic Radiator Valve 15mm Angled Full Chrome TRV Gold
