The Axiom Maintenance Kit for HP LaserJet 4240 (MPN: Q5421A - AX) is an essential component for maintaining the efficiency and longevity of your printer. This kit includes a refurbished fuser assembly that has been thoroughly cleaned and tested to meet or exceed original specifications. It is compatible with various HP LaserJet models, including the 4240n, 4250, 4250n, 4250tn, 4250dtn, 4250dtnsl, 4350, 4350n, 4350tn, 4350dtn, and 4350dtnsl. The kit is designed to provide reliable performance, ensuring high - quality prints and reducing downtime. Axiom uses genuine OEM fixing film sleeves in their fuser rebuilds, guaranteeing a dependable solution for your printing needs.