They make adapters specifically designed for this, lol. $14 on Amazon. Also, instead of necking it down to 5/8" or 3/4" hose, and instead used a 2" hose, your flow would be better.
Hi Janis, it’s a small Harbor Freight pump and I added a couple brass fittings and some PEX on each end. I believe it’s this pump www.google.com/shopping/product/8153480480989311844?q=harbor+freight+pump&client=safari&channel=iphone_bm&biw=390&bih=661&tbs=vw:l&prmd=sivn&prds=eto:17528357943023487440_0,cdl:1,prmr:1,rsk:PC_10294496237081598436,pid:230681046116264243,cs:1