Secoh SLL - Series Air Pump Repair Part Diaphragm Kit DIY for Septic and Pond Aerator Repairs SECOH SLL-20, SLL-30, SLL-40 and SLL-50 Pumps Includes 2 Diaphragms, 2 Valve Boxes, 1 Air Filter with Filter Gasket, 1 Base Tank Gasket and Instruction Easy to install Comes in Vacuum Sealed Aluminium Packs Original OEM parts from SECOH