this is even cheaper

http://www.amazon.com/Como-Non-Return-Check-Valves-Aquarium/dp/B005HTT1P4/ref=pd_sim_petsupplies_1?ie=UTF8&refRID=1RBSX4VDBYDGVVXK1GH2

所有跟帖： 

• NICE:-) 但有个小担心就是拧松的Bleeder screw会Suck空气进取，你涂grease吗？ -5W40- ♂ (0 bytes) () 05/13/2014 postreply 12:52:19

• 没有grease，loose bleeder quarter turn, you can hand push piston ba -顺序是否有要求- ♂ (76 bytes) () 05/13/2014 postreply 13:01:47

• 谢谢，回头去渔具店瞅瞅有卖单向阀的没。 -5W40- ♂ (0 bytes) () 05/13/2014 postreply 13:06:02

• 还是不方便，因为 -MoonRiverMe- ♂ (56 bytes) () 05/13/2014 postreply 17:03:04