https://b2bofficeinteriors.ie/product/connector-plugs-and-adaptors/
Connector Plugs And Adaptors Male Or Female - B2B Office Interiors
3PG/M - Male 3-pole re-wirable 3-pole connector 3PG/F - Female 3-pole re-wirable 3-pole connector
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https://www.caravanaccessoryshop.co.uk/category/caravan-mains-hook-up-leads/204
Mains Leads, Plugs and Adaptors | Caravan Accessory Shop
plugs and adaptorsmainsleadscaravanaccessory