Sounds like you put the seal in backwards. The round part that actually makes the seal (and connects to the tap handle) has a specific orientation. If you put it in backwards it will not be able to make a full seal. Try taking it apart and flipping it around, you should be able to make a good seal after that.
Secondary: 10gal-Double IPA, 5gal-Pure Apple Cider,
Kegged: 10gal-Christmas Ale, 5gal-Hopped Up Stout, 5gal-Light Rye Ale, 5gal Dunkel Bock
Bottled: DFH 120 Clone (Kicks your A$$)
"Brew happy, brew often, and always brew with friends." -Me
"I dont home brew because I'm poor, I'm poor because I home brew!!!" -Me
"If I ever leave this world alive ill be drinkin up in the sky, with you my friend by my side" RIP B.G.
And always remember friends "Do NOT set yourself on fire"