Good eye. Never even noticed they were pressure fittings.Don’t you dare put a check on drain just another obstruction waiting to cost you and then the snake tears it up. No do t do that. You pictures have pressure fittings. Don’t do that. Need dwv fittings. Clean out will be trap and studor vent you install for sink. But long as you have smooth turns you can corkscrew a drain just no pressure fittings
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