Manabloc Valves
Well today we work on our water system , Manabloc which has not worked for some time now . The one thing that they have improved on is the key , or the end of the valve, It is bigger and looks stronger , I don't know if you can make that out on the picture
Any way that will elevate some problems down the road , the one thing i will do is put a little lubricant {non petroleum } on the o ring and ones a month turn them, just for good measure.
Rob