Nalgene 15mL conical centrifuge tubes use 17mm caps
Nalgene 50mL conical centrifuge tubes use 29mm caps
Nalgene 12ml round Use 16mm caps for bottom centrifuge tubes
Nalgene 15ml round bottom centrifuge tubes use 16mm caps
Nalgene 16ml round bottom centrifuge tubes use 18mm caps
Nalgene 38ml round bottom centrifuge tubes use 25mm caps
Nalgene 50ml round bottom centrifuge tubes Tubes use 29mm caps
Nalgene 100ml round bottom centrifuge tubes use 32mm caps

Recycling Information:
Reusable Nalgene Polypropylene (PP) and Polypropylene Copolymer (PPCO) centrifuge tubes can be centrifuged multiple times under typical laboratory conditions. However, like all durable products, they are eventually discontinued and replaced. In many communities, these centrifuge tubes can be recycled. After product end-of-life, clean and recycle your Nalgene PP and PPCO centrifuge tubes if recycling services are available in your community.