Magplastic Asia Pvt. Ltd. Offers Cavity Stretch Blow-Moulding Machine. Magplastic Asia Pvt. Ltd. Designs and manufactures different types of two stages Stretch- Blow moulding machines. The Cavity Stretch Blow-Moulding Machine is specifically developed for the production of large capacity single use or refillable PET containers - ranging from 11L to 26.5L [3 to 7 gallons] for nominal output up to 800 containers / hour.