Duo-Check Style G Retainered Wafer DUO-CHEK-NONSLAMCHECK-BU-ENÂ /Â Wafer Styles G (Retainered) and H (Retainerless) Style H Retainerless Wafer DUO-CHEK-NONSLAMCHECK-BU-ENÂ /Â Wafer Styles G (Retainered) and H (Retainerless) Retainerless Wafer Double Flange DUO-CHEK-NONSLAMCHECK-BU-ENÂ /Â Style H Double Flanged Retainerless Retainerless Wafer Lug DUO-CHEK-NONSLAMCHECK-BU-EN / Style H Lug Retainerless Style X Extended Body Wafer DUO-CHEK-NONSLAMCHECK-BU-EN / Style X Extended Body Wafer Check