I'm not really sure since I have not in the past used either of those 4 valve heads. I have not stocked them in a while for they just don't move fast enough and when I purchase them I have to purchase at least 10. I'll order from one of 3 known Taiwanese exporters. Most of what Taiwan sells is made in China just like here but the difference is the Taiwanese develop their own product and have an excellent quality control.
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