I ordered the quick twist drain plug from Amazon -m14x1.5 as recommended for my '21 F350 7.3L, only to find out it was too big. After looking at the Ford parts website, I need an m12x1.75. I contacted customer service at Valvomax, and they handled the replacement and reimbursement for the wrong part exceptionally well. No company is perfect, but when they handle a problem as well as Valvomax customer service did, I will recommend them to everyone I can. Thanks Mike!