Authentic HIBLOW diaphragms and casing blocks have the HIBLOW logo as circled
For HP-60 and HP-80 HIBLOW air pumps - standard and alarm units
Install in 15-20 minutes with a few common household tools.
Go to HIBLOW's website - support page - for a video tutorial
The Complete Kit includes everything you need to rebuild your Aerator. It comes with, 2 Diaphragms, 4 Air Valves, Mounting Blocks, Heads, Black Safety Screw, Safety Nut for Safety Screw and A Brand New Filter