Site glass and drain tubes?

[Gamble97]

Who sells those drain tubes where you connect the hose at the bottom? Or an 1/8" or 1/4" knurled knob/bolt that I can use for a drain?

Also who sells site glasses? This something you can find at home depot or no?

 

[TSITurbo95]

For the sight glass, you can use clear hose and hose barbs, or they have the actual sight glass.

Perhaps something like this?

Sight Glass, Glass Sight, Easy-to-See, With Reflector, Max Visibility, 3/4 NPT | eBay