Tech Tip: 3/8in extension a perfect fit for M14 triple square Jan 20, 2015 19:34:07 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by vanapplebomb on Jan 20, 2015 19:34:07 GMT -5 No joke,For that one M14 triple square oil pressure control valve retaining bolt, a 3/8in drive socket extension is a perfect snug fit!