What kind of air pump for a Benjamin Maximus 22 air rifle

Have had a couple of break action German RWS air rifles in the past but the first PCP rifle is a Benjamin Maximus 22 cal, see the air pumps as cheap as $50 Chinese to several hundred dollar pumps. Any tips on what kind of pump would be worth buying, plan on using the Benjamin for cleaning out some of the yard vermin. Thanks Ron
 
Depending on your wallet there are the Cheap but effective Chinese pumps that are in the $50 range that you add a $50-$70 inline filter to so you don't introduce moisture into the gun and the Hill brand with moisture absorbing dry pack attachment. 

Wal-Mart has the optional protection plan which I would pay for the longest extended plan available if not mechanicanically inclined to service or fix it yourself. That way you get a refund or an exchange for a brand new one or free upgrade if it becomes obsolete.

https://www.walmart.com/ip/VEVOR-Airgun-PCP-Pump-High-Pressure-Hand-Pump-3-Stage-Stirrup-Pump-Up-To-4500PSI/906473104?athcpid=906473104&athpgid=athenaItemPage&athcgid=null&athznid=PWVAV&athieid=v0&athstid=CS004&athguid=7e9e7eb8-006-1743c765b87d13&athancid=null&athena=true

There is the Umarex brand made by Hill but you must buy the $49 dry pack as well. Just buy whatever your wallet allows.