Didn’t have one on hand, so I used a U bolt with a bar and moved the nuts up the threads until the bolt seated to the bottom of the plug (bung). Then I put a hammer handle through the u bolt and turned it. Worked better than I expected. Just thought I’d share if you get in a pickle. U bolts cost like $2 those barrel openers are like 10-15.
Here is a picture of one similar to what I used. https://www.amazon.com/National-Hardware-N222-174-2190BC-plated/dp/B000BPRP8Y?ref_=s9_apbd_orecs_hd_bw_b16qvP&pf_rd_r=PS9D3EWCFYQGGMW921G2&pf_rd_p=60e83cf9-f1a4-5fec-90f0-3aab62d97323&pf_rd_s=merchandised-search-10&pf_rd_t=BROWSE&pf_rd_i=16409751
The U bolt didn’t fit exact, so pump pliers and some elbow grease made it fit just right (I bent it). I didn’t want to take a hammer and a screw driver and pound away on the plug until it turned, because the barrel and the plug are plastic. I also wanted to seal it back up after I got my SH transferred.