Bung Cap 2" NPT with 3/4" Knock Out (Fine Thread) with Gasket for Poly Drum, Brand New (2 Pack) $6.99 B014EGGB8U
Bung Cap 2" with 3/4" Knock Out (Fine Thread and Coarse Thread) with Gasket for Poly Drum, Brand New (Combo Pack) B014JNFOWW