Qingdao Gofai rubber product silicone rubber products. 
and have some rubber caps and rubber covers and rubber sleve for electric cigaretter.
also accept customized size too. 
For more details, please feel free to cotact with Kathy Zhao
Email: chinarubber@aliyun.com 
 

● Protect BNC ports from being exposed and keep your network equipment safe from dust, debris and moisture, extending the lifespan of your device.
● Fit for any standard BNC ports of switches, routers, network cards & media converters and more.
● Made of high quality durable and reliable silicone material, exhibit a high level of resistance to harsh environmental factors and retain their shape and flexibility even after frequent use.
● Easy to insert and remove, fit snugly and stay in place.

Audio 6.35mm Earphone Silicone Rubber Dust Cover will protect your device from dust and water. 
Net Weight: 1g; 
Material: Silicone Rubber 
Item(s) Included: Earphone Port Dust Cover 
Fit for: Audio 6.35mm Port

● Protect 1394 4pin ports from being exposed and keep your network equipment safe from dust, debris and moisture, extending the lifespan of your device.
● Fit for any standard 1394 4pin ports of switches, routers, network cards & media converters and more.
● Made of high quality durable and reliable silicone material, exhibit a high level of resistance to harsh environmental factors and retain their shape and flexibility even after frequent use.
● Easy to insert and remove, fit snugly and stay in place.

● Protect SFP/SFP+ ports from being exposed and keep your network equipment safe from dust, debris and moisture, extending the lifespan of your device.
● Fit for any standard SFP or SFP+ slot of your open ports of switches, routers, network cards & media converters and more.
● Made of high quality durable and reliable silicone material, exhibit a high level of resistance to harsh environmental factors and retain their shape and flexibility even after frequent use.
● Designed with a pull-out tab, easy to insert and remove, fit snugly and stay in place.

● Protect SFP/SFP+ ports from being exposed and keep your network equipment safe from dust, debris and moisture, extending the lifespan of your device.
● Fit for any standard SFP or SFP+ slot of your open ports of switches, routers, network cards & media converters and more.
● Made of high quality durable and reliable silicone material, exhibit a high level of resistance to harsh environmental factors and retain their shape and flexibility even after frequent use.
● Designed with a pull-out tab, easy to insert and remove, fit snugly and stay in place.