Bath Replacement Sink of the tap head 2 beams: aerator and jet switching functions manually. 1/2 fitting. 1/2 inch is about 21mm. The internal thread to be black! Exterior thread: total length 17mm. Of which unscrewed party jet shower shower head for kitchen faucet Swimming bath replacement of the tap head 2 beams: aerator and jet Switching functions, manually. 1/2 fitting. 1/2 inch is about 21mm. The internal thread be black!