Part Number : 3528003C1. Thread Size: 3/4″-16. 4000 Series: 4100, 4200, 4300, 4400, 4700, 4800, and 4900 (including LP and Fire Truck variants). Compatible International Series & Models. 9000 Series: 9100i, 9200i, 9400i, 9800, and 9900i/ix.