this snap ring is to prevent the expansion ring from moving backward therefore the claw like ring teeth will be expanded to release their clamping of the insertion pipe by the long plate 12 of expansion ring 1 after pulling out the pin 7 and allowing claw check ring 2 to move backward with the insertion pipe at this stage the insertion pipe can be smoothly pulled out of the fitting outlet and no additional tool is required it 39 s simple and easy to complete the separation of the insertion pipe the integrated assembly components are connected to an external pipe or faucet as shown on fig4 simply and directly plugging the desired end of the insertion pipe into the fitting outlet to have the claw like ring teeth to claw check ring firmly clamp the outer surface of the insertion pipe pin 7 stops claw check ring 2 from moving backward consequently the insertion pipe cannot be moved back to separate from the fitting the push forward of the insertion pipe to curls the ball ring 31 of snake tail ring 3 to entirely cover the gap between the insertion pipe and the interior of the fitting meanwhile the front pipe end of insertion pipe will cause filter ring 4 to move forward to push the valve disc 51 of swing check valve open to let water flow through referring to fig5 when pulling out the insertion pipe is desired the pin 7 is pulled out to release the restraint of the claw check ring 2 then a force is applied to the insertion pipe to pull it outwardly at this moment no restraint is applied to claw check rig 21 so it can move backward with the insertion pipe expansion ring 1 sill be.