High-quality home heating pump diaphragm manufactured by SSC, part number S-066.
RESTORE RELIABILITY: Replace your old, worn-out pressure diaphragm to restore steady fuel flow and keep your home heating system running safely and efficiently.
PRECISE 1-3/4" OD SEAL: Designed with an exact 1-3/4 inch outer diameter for a dependable, leak-free fit inside your oil burner pump.
PERFECT REPLACEMENT: Designed exactly for Suntec A-Series oil burner pumps, directly replacing OEM parts 3773151 and GS-165 without modifications.
FIX PUMP ISSUES: Stop annoying pump cycling, prevent messy fuel leaks, and cure inconsistent furnace combustion with this simple replacement part.