Plunger: 9H5797 1W6541 1W6539 6N7527 Plunger: 1. 9H5797, 1W6541, 1W6539, 6N7527, 8N3539, 7W0182, 7W5929 2. Package: anti-rust proof paper, into nylon bag, individually paper box 3. Application: Caterpillar engine 4. Quality: under warranty plunger 1W6541