New member here looking for a Graham White valve to purchase, new or used.
Get the HornBlasters clone! Exact in every detail! The main difference being the price, a new GW is £169, HornBlasters Clone (black widow) is £69!!!
Make perfect sense. 
Thank you for the advice Stinky, but I also heard about the clone’s handles breaking. I heard they make the handle with a zinc alloy instead of solid aluminium like the GW valve handle. I just bought a 10 year old, never used GW on EBay last night. Got it for $130 and it is not metered like the newer ones.