Angled VT15 TRV & Lockshield, 15mm. Reliable, robust and trusted, the VT15 may be our low-cost TRV, but it is still manufactured to the Honeywell Home high standard. Additional features: |Easy to grip TRV head with bold, black on white numbering to help users with impaired dexterity and/or impaired vision. |Bi-directional flow design which can be mounted vertically or horizontally. |Max/min temperature limits and frost setting.