What causes quick-release couplings to leak?

Another reason you may be experiencing leaks is if the tubing was not cut correctly. If the tubing is cut in a diagonal shape instead of a square, the O-ring may not be able to seal all around the tubing. Another potential problem is a torn O-ring. If the tubing is not cut correctly and has a sharp point, the sharp point can damage the O-ring and prevent it from sealing. Excessive side torque or side loads can also cause leaks in the fitting. If you try to bend the tubing to connect to a water treatment system, the tubing itself may stretch the O-ring into an oval shape, which can cause the seal to fail and cause the fitting to leak. Frequently taking the tubing apart and leaving it alone can gradually damage the tubing. The metal teeth on the inside of the locking collet bite tightly into the tubing. Each time the tubing is removed from the fitting, a small amount of the tubing may be scraped off. Over time, this frequent removal may cause the tubing to be scraped so deep that it bypasses the O-ring and allows water to pass through. If you need a fitting that can be connected and disconnected repeatedly, you may want to consider a quick-release fitting.

What temperatures and pressures can quick connect fittings withstand?

The pressure rating of a quick connect fitting depends on the temperature and the size of the fitting. The warmer the water, the lower the pressure the fitting will experience. This has to do with the expansion and contraction of the plastic. The larger the tube and the stiffer the tube, the more pressure the fitting will experience. Both pressure and temperature must be observed to determine the pressure limit.