Like PR-2#, PR-4# is the very first CRC & TE (child proof and tamper evident/proof) e-liquid bottle. Caps and Tips are both different from PR-2# and tips cannot be inserted in caps for PR-4#.
It comes in Soft PE and Clear PET, with a wild selection on cap colors as you can see from images here.
10ml, 15ml, 20ml, 30ml, 50ml, 60ml, 100ml and 120ml (PE)
10ml, 15ml, 20ml, 30ml, 60ml (PET)
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PR-4# PE PET Plastic Child Proof E-Liquid Bottle CRC TE
This product is GCC Certified.