the length of trocar 12 is such that when it is inserted far enough for pin 56 to engage slots 46 it is necessary to elongate stretchable section 18 for the manner in which gastrostomy tube 10 would be implanted and employed as a feeding tube reference is made to fig3 and 4 where is shown abdominal wall 62 and stomach wall 64 of a patient in which gastrostomy tube 10 is to be implanted initially the site of the implant is located and the installation procedure monitored using conventional techniques not forming part of this invention for example through the oral passageway may be inserted a fiber optic endoscope to light up and view the interior of the stomach and air under pressure to inflate the stomach causing the wall of the latter to press against the abdominal wall as seen in fig3 when the location is selected an incision is made by a surgeon this is followed by inserting trocar 12 engaged with tube 10 in a stretched state through the abdominal and stomach walls 62 and 64 as shown in fig3 until collar 16 is flush or almost flush with the outer surface of the abdomen then compressed air is delivered.