a nylon hex hexagonal plumbing lock nut and a pair of black rubber gaskets seals

accessories accessory backdrop background bathroom black bolt bolts fasten fastened fastener fasteners flange flanged gasket gaskets gauge gauges go-no-go hex hexagon hexagonal hold holding imperial inch inches iso leak leakage leakages leaking leaks lock metric nut nuts nylon pair pairs pipe pipes piping place plastic plug plugged plugs plumber plumbers plumbing rubber seal sealed seals shaped shapes spanner spanners stack stacked system thread threading threads tight tighten tightened toilet torque two underneath white wrench wrenches