If you do decide to replace the head... a Lavac head might be a good option, especially if no one on your boat is susceptible to mal-de-mer...
BTW, the check valve is generally called a joker valve... I always wondered about the name and why it was called that.
__________________
Sailingdog
Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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