Superior Tool Basin Nut Wrench. For over 60 years, we've been offering customers worldwide the absolute best value in professional quality and innovative products. Unique slots grab locknut wings without breaking them off. Universal tool fits metal lock nuts, coupling nuts, PVC locknuts, most metal and plastic toilet supply nuts. Cutaway design fits around existing supply lines to remove coupling nut. Cutaway fits around the faucet shank (1/2 in) to remove metal and plastic nuts. Universal tool fits metal lock nuts, coupling nuts, PVC locknuts, most metal and plastic toilet supply nuts.