This is the best valve to buy for installing a towel rail as dual fuel as it allows the flow/return to be located on the same side of the radiator - leaving the opposing side free for the element (so no T-Piece is required as with a standard dual fuel set-up with a pair of valves). You are able to have the flow and return going in and out of this valve as the flow goes up the tube and the return comes back down the outside of the tube. Straight orientation - can be fitted on either side of towel rail. Chrome in colour. Full contents list: 1x Chrome plated brass integrated thermostatic valve body (to fit into a single tapping on a radiator, and giving you 50mm pipe centres), 1x Chrome plated Plastic/Brass Thermostatic head, 2x Chrome plated brass Nut for adapter, 2x Brass Nipple for Multilayer pipe adapter, 2x Rubber Sealing for copper pipe adapter, 2x Brass clamping ring for copper pipe adapter, 2x Brass stop ring for copper pipe adapter Carlo Poletti TRV Heads have a thermostat liquid