The last SG20 I bought was 6 yrs ago. It lasted one season and the pump seals failed. I was disappointed with the cost of parts and the lack of availability so I stripped it down and converted the tank to a saddle tank for my Z spray. An electric pump and a few plumbing parts and I now have an independent sprayer with jet agitation for my ride-on. It sprays 1/4 gal per minute.
I have been using Echo BP's since and have had zero issues. Even though my MS-50's have been discontinued by Echo, I am still able to view parts lists and purchase parts online.
I understand mfg to dealer loyalty but not offering parts online is poor business for this day in age in my opinion.
"The Poor Fish" circa 1930's: The Poor Fish wouldn't have been caught if he'd known enough to keep his fool mouth shut.