oil drain valve市场上早就有了啊。
所有跟帖:
• https://www.amazon.com/EZ-Oil-Drain-Valve-removable/dp/B00HTV2N4 -中线- ♂ (0 bytes) () 07/09/2017 postreply 06:42:35
• google fumoto valve. i have used it for 6 years -老生长谈- ♂ (0 bytes) () 07/09/2017 postreply 09:55:06