check valve

[pipeline]

bought some check valves from screwfix for my shower and the arrow was pointing wrong way on one of em,, could of saved my self alot of time if i just blew in to it,, u live and learn, any 1 had this problem before or have any other tips like this 1. thanks men

 

[CXR100]

there is usually an arrow on the side! some ar so springy i cant even blow into them!!!!