From Pikey, who posted this recently in a DIY skimmer thread:
Too good not to share here in this sticky thread.
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I just found a local (10 miles from home) plumbing store that sells Spears 4" schedule 80 slip/slip unions for $25.00. I bought two. The cheapest place I found them up until now is $30.18 each. CustomAquatic sells these for $49.99. These are the same stock number as the ones on that site for half the price and no shipping. I am really happy.
FERGUSON'S
1020 US HIGHWAY 45 BYP, JACKSON, TN 38301
Phone: (731) 664-6400