Toilet line vents

[Cjwelch]

I installed the curved vents in the lines for the head and now the water wont come into the bowl as high as it would before. Maybe the vent makes the swan neck too high? Any suggestions?

[HopCar]

Did you put the vented loop, on the intake side, between the seacock and the pump?
That would let air in and reduce the ability of the pump to bring water into the bowl.

If possible on your toilet, the vented loop should go between the pump and bowl. Vented loops should always be installed in pressure lines not suction lines.