Hi my fans,today I check my new one way valve.I blow to pop a big Belbal 24"(B 250).Is my first btp with this balloon.The latex is more strong but I will try to blow to the max for get the neck.Woow the balloon is more impressive the Belbal Company declair it a 24" but her body is more big respect a Q 24".The clip is full I start when balloon is deflate and finish when burst.18 minutes of only blow and blow, sometimes I stop for look how big is! I gift 3 minutes.You can found and buy these valves at my ebay store.------------http://www.ebay.it/usr/12valvole------------