7/8 UNS outside thread.
Inner threaded to suit modern plugs, giving a wider range of available plugs.
NGK BP6ES plugs are suggested for completely overhauled engines.
$40ea inc. copper washer
Prices subject to change without notice.
All prices include GST.
Tags: Vintage Sparkplugs, Vintage Car Sparkplugs, Vintage Car Sparkplug Replacement, Vintage Car Sparkplug Adaptors