Landing Nipple 3 : A receptacle in a production string with an internal profile to provide for latching and sealing of various types of plugs or valves. (RP 57)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}