Spare Rubber Band and Launch Cord Subkit

Rubber bands and braided paracord for your water rocket launcher.

Five non-latex blue EPDM #33 elastic bands and 3 meters (10 feet) of 1.18mm 100lb tensile strength orange paracord, to be precise. Both made in the USA.

Already included in the full launcher kit, so no need to purchase separately.

Are these a must? Not at all. But they're pretty great.

Safety disclaimers

Note that this launcher design remains an experimental work-in-progress and is not a toy. This kit is made available for convenience and is not warranted for suitability for a particular purpose. Design defects may exist. A responsible supervising adult must make a determination of whether your particular combination of printed and non-printed parts, ground anchoring systems, bottles, hoses, pressurizing systems, personal protective equipment, protocols, users, and environment are safe for your application. 

The launcher must be firmly anchored to the ground for use. Never point at anyone or anything. No one should ever have any body parts above a pressurized bottle, as the bottle may disengage unexpectedly at any time and cause injury. Heat may cause deformation of parts and all parts should be inspected before every use.

Pressurized systems are inherently dangerous. Adult supervision is always required. No warranty or guarantees are made regarding the safety, performance, or completeness of any designs, models, instructions, or analyses presented.