What is the difference between magnetic, steel and aluminum headspace caps/septa.
There are the caps/septa I am referring to are P/Ns:
8010-0165
https://www.chem.agilent.com/store/productDetail.jsp?catalogId=8010-0165&catId=SubCat3ECS_31734
5190-3987
https://www.chem.agilent.com/store/productDetail.jsp?catalogId=5190-3987&catId=SubCat3ECS_31734
5183-4477
https://www.chem.agilent.com/store/productDetail.jsp?catalogId=5183-4477&catId=SubCat3ECS_31734