A grey plastic plug to fit open ended pipes.
KK133-A fits into 3/4" IPS, Sch 40 pipe. 1.05" OD x 0.75" ID
KK133-B fits into 1" IPS, Sch 40 pipe. 1.315" OD x 1" ID
KK133-C fits into 1-1/4" IPS, Sch 40 pipe. 1.66" OD x 1.25" ID
KK133-D fits into 1-1/2" IPS, Sch 40 pipe. 1.90" OD x 1.5" ID
KK133-E fits into 2" IPS, Sch 40 pipe. 2.375" OD x 2" ID