Dawdix Outdoor Sprinkler Toy | Water Rocket Outdoor Sprinkler Toy for Kids Age 3+, Summer Cooling Yard Games Funny Water Spray Toy (da-PSHJ)

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This is an optional step, but adding it prevents users from over-pressurizing the system to a point of failure. Thanks to aaron.linker for suggesting it! If the pressure goes over the max set on the relief valve, it will "pop" to relieve the pressure and then close again.

PVC Primer is usually purple and both stains and dissolves like crazy. It also smell bad. Be careful with it. Put down a drop cloth and wear old clothes and do this work in a well ventilated area (like outside). There always seems to be a little bit of primer left on the lip of the can, blot it up with paper towel so you don't spill it! Prime both parts that you're joining, and then apply glue to both parts to be joined. You want enough glue that you see it pushing out of the connection, but not so much that it drips or runs. Do not prime all of the pieces first - they're only likely to get grimy while you're glueing. Only prime as you go. Tip: It is often very useful to insert a non-glued piece into an elbow to help get the angle right for the other side of the elbow that you are gluing. But that's for new well care for pipe, not something that is getting bumped around constantly, pressurized and depressurized, and worst of all - left out in the sun to deteriorate the PVC. Sadly, as with all things, the integrity of your launcher will eventually deteriorate until it fails. So we take steps to lengthen the time to failure and reduce the hazard when that failure occurs. Glue the other elbowed tube to the Tee, this time using the table to keep the frame even. You don't need to use the launch tube to line things up since the other side should be even with the launch tube, then assuming your table is flat, the newly glued side should be parallel with the first side. I used an 80 PSI pop-off (also called a safety relief pressure valve). 80 PSI should be more than enough pressure, since the two inch pipe designed launchers never really need to go above 30 PSI.I'll probably just right a new instructable with updates and put a note at the top of this one pointing there instead of correcting here. The only launchers I make these days are galvanized steel with threaded ends. Good sprinkler valves are hard to come as well (3 x 9V batteries can overcome that in many cases - worst case scenario you can always twist the solenoid to launch). The launch tube and launch button holder just makes all of the parts one piece so that it's easier to carry. I used hose clamps to hold the holders onto the frame tubes, but zipties would probably work as well. Hold the pieces together firmly for 10 seconds while the glue sets. If you don't hold the pieces pushed together, they will push apart!

I recommend you in PETG or a material which wont get soft in the sun. Of course PLA will still work. Just don't leave it out.A final update here: we had two launch events and the new launchers were wonderful! they upped the fun factor by like 3-4x! Thanks so much for your work here! All threaded connections should be taped to prevent leaks. The teflon tape we use is either white or yellow. The yellow tape is most often used for gas and iron pipe while the white tape is often used for water and copper pipe fittings. Air being a gas you might be inclined towards the yellow tape. But I've used both and they both work just fine even at really high pressures, so you might want to let price dictate: white tape is about one third the price of yellow.