Engineering plastic used for connector is resistant to high temperatures and all common automotive chemicals. EPDM Diaphragm compatible with different types of brake fluid (DOT 3/4/5). Silver plated terminals for good electrical contact and corrosion/tarnish resistance. Zinc plated steel body for good corrosion resistance in severe conditions (back to back salt spray testing showed advantage of our parts against OE - longer time to red corrosion). Fits 2008-2017 Harley Dyna FXD Super Glide, FXDL Low Rider, FXDWG Wide Glide, FXDB Street Bob, FXDF Fat Bob, FLD Switchback Replaces HD #72026-08A