http://www.made-in-china.com/image/2f0j00ILQETNaqIgeCM/Rubber-Syringe-Plunger.jpg
Product Description
Product Origin: China
Brand Name: YIMENG
Other Price Terms: FOB
Payment Terms: L/C, T/T
Delivery Lead Time: Within 2-3 weeks after receipt of L/C

Detailed Product Description
Specifications:
Capacity: 1ml, 2ml, 5ml, 10ml, 20ml, 50ml, 100ml

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http://www.pippinsroost.com/baby.htm
BAXA O-ring Syringe The exclusive BAXA syringe plunger is made of a silicone 0-ring sandwiched between two layers of plastic. This greatly increases the life of the plunger and allows for a smooth, steady "Push" of the handfeeding formula through the syringe. Syringes and plungers must be washed and disinfected carefully between uses, since food particles can get stuck between the layers of the 0-ring "sandwich." 10cc and 20cc syringes have offset tips; the rest have centered tips.

   "Êmbolo no final da seringa não se desprende por possuir anel de retenção, evitando acidentes e perdas de substâncias. "

   So, the plunger is the 'êmbolo' itself, and 0-ring is the "anel de retenção".

   That said, he/she put the plunger in...means that he/she inserted the plunger into the syringe to suck something through it (for instance, blood) or to feed parrots and macaws and so on and so forth (like shown in the site http://www.pippinsroost.com/baby.htm. )

   Hope it somehow helps.

   PP.