It’s not big enough to the 5 gallons that you said you were brewing with it,at a bare minimum 128 gph or 2.1 gpm won’t provide enough aeration let inside your brew.
It’s not about the amount of outlets but the volume needed to get dissolved oxygen content to around 11 ppm. The issue is creating the right environment for aerobic microbes to flourish and outcompete anaerobic ones. A few years ago people did say that a pump of that size would be ok but as more research has been done on different systems it was found that they just don’t do the job.
A set up like this is would cost me around $50 in Australia so probably less in the U.S or U.K . Not only does it provide the right amount of dissolved oxygen but it is drawing water from the bottom and pumping it up to the top agitating the brew which helps release the microbes from the compost and prevents any dead spots forming. It can be pulled apart in a minute so can be cleaned properly unlike an airstone