BP then inserted a riser insertion tube into the pipe and a stopper-like washer around the tube plugged at the end of the riser and diverted the flow into the insertion tube.[77] The collected gas was flared and oil stored on board the drillship Discoverer Enterprise.[78] Before the tube was removed, it collected 924,000 US gal (22,000 bbl; 3,500 m3) of oil.[79] On 3 June 2010, BP removed the damaged drilling riser from the top of the blowout preventer and covered the pipe by the cap which connected it to another riser.[80] On 16 June, a second containment system connected directly to the blowout preventer began carrying oil and gas to service vessels, where it was consumed in a clean-burning system.[81] The United States government's estimates suggested the cap and other equipment were capturing less than half of the leaking oil.[52] On 10 July, the containment cap was removed to replace it with a better-fitting cap ("Top Hat Number 10").[82][83] Mud and cement were later pumped in through the top of the well to reduce the pressure inside it (which didn't work either). A final device was created to attach a chamber of larger diameter than the flowing pipe with a flange that bolted to the top of the blowout preventer and a manual valve set to close off the flow once attached. On 15 July, the device was secured and time was taken closing the valves to ensure the attachment under increasing pressure until the valves were closed completing the temporary measures.[84]