3/4 in. PVC Internal Domed End Cap (Box of 200) — FORMUFIT Direct
Charlotte Pipe 3/4-in. PVC SCH 80 Cap for Pressure Systems, Maximum Pressure 690 PSI, NSF Safety Listed in the PVC Pipe & Fittings department at Lowes.com
STZ 3/4 in. Black Iron Cap 310 CA-34 - The Home Depot
IRON PIPE END CAP 3/4" - Northeast Agri Systems
3/4 in. 3000# Forged Carbon Steel NPT Threaded Cap Pipe Fitting