Caps that fit real bottles: PCO-1881, PCO-1810 and 38 mm necks: spare caps, hanging eyelets, and a coupler that screws two bottles into one container.
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Standard PET necks: PCO-1881 and PCO-1810 (soda and water bottles) and 38 mm necks (milk and juice). The cap threads onto the bottle like the original.
Yes, the coupler variant has a thread on both ends, for storage tubes, funnels and rocket projects.
Necks vary slightly by brand; regenerate with 0.1 mm more clearance. PETG flexes onto the neck instead of cracking.
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