Dial 3437 Mastercool Cooler Pad, 40" x 23" x 8"

Just needed one piece of styrofoam on the side to snug it up. Perfect fit on top. Never had an evap cooler that used these pads until now. These things cool the air down maybe 15 or 20 degrees when it’s in the mid 80s easy. Would buy again for sure!

Perfect for my aerocool 4800 down flow!

If you have to replace the cooler pads for the particular Mastercool that they fit, they are a perfect fit. To bad they don't include the replacement styrafoam spacers also!!

Our original pads were 3 large and 1 smaller had these pads for 6 years. When we received only 2 pads I got worried but these 2 pads fit our unit perfect! Second concern was regarding the smell. Yes it did stink for about 5 hours running it, expected to sleep in our Rv but by shutting down the unit for the night it was ok the next night.

Good quality. $45 cheaper than Home depot.

I bought this pad last season from marketplace seller "True Value Hardware Outlet" and am into my second season with them. They are working well and changing the pads made a huge difference in cooling (old pads were almost 6 or 7 years old).What I did this season though is I got one of the $4 cooler pump by-pass kits that hooks to the output of the pump and allow you to trickle a little bit of the water thru the overflow hole so that the water in the cooler changes more often and doesn't build up mineral content and prevents the pads from scaling up so fast. That should make a huge difference in how long these pads last and I'm watering my neighbor's apple trees at the same time! Those are some good apples and with more moisture it should be a good harvest this year...James

it comes in two parts that fit side by side in your swamp cooler. the directions were not thorough to me, but i watched another review which instructed me on which direction to install them. if installed backwards, the air flow is not good and thus, won't cool off effectively. they stamped directional arrows on the sides, but it was somewhat faded and hard to read. once installed, they worked well. i did not smell a weird odor when first installed and the swamper turned on....as others smelled. overall i'm satisfied!

It fits perfect wash them first leave it on for a few hrs and drain water from cooler 3 times in a week and the smells willl go away other than that i'm happy with my master cooler