Swimquip Model WC27-92

I have a older (mid 60’s?) Swimquip Model WC27-92 skimmer with two ports at the bottom, one to the pump suction and the other threaded female fitting to the bottom of the pool. I would like to plug the fitting to the bottom of the pool.

I understand there is a Swimquip Model WC27-92 plug, does anyone know what the part number (or where to find this part) is?

Since Swimquip went out of business is there an equivalent manufacture (Pentair) and model for the now obsolete Model WC27-92?

Thank you.

An Alternative to the part number would be the fitting size (1-1/2" NPT?)