Under-Sink P-Trap Riser Shelf
A 140 x 95 mm riser shelf that slides in around a bathroom sink drain so the dead space beside the P-trap becomes usable storage — the 52 mm wide U-slot (26 mm end radius) clears common 1-1/4 in and 1-1/2 in tubular tailpieces and their slip nuts. Four hollow 18 mm legs give 45 mm of clearance over the cabinet floor, 7 mm drain slots let a drip pass straight through instead of pooling under your bottles, and each foot has a 4.5 mm M4 clearance hole if you want to screw it down.
bathroom under-sink p-trap shelf