A moving image of a regulator with a backflow function can be seen here.
A moving image of a direct operated regulator (relief type) can be seen here.
The ITV series catalog can be found here.
The ITV1000/2000/3000 series troubleshooting guide can be found here.
The ITV series (CC-Link compatible product) operation manual can be found here.
For details on how to set the switch output, refer to the ITV series operation manual, which can be found here. 
The AR-A, AR-B, and AR-D series operation manuals can be found here.
The modular F.R.L. unit catalog can be found here.
The ISE35 operation manual can be found here.
The discontinued AR series catalogs can be found here.
Details on the round type pressure gauge (with color zones) can be found here.
A moving image of a regulator with a backflow function can be seen here.
A moving image of a direct operated regulator (relief type) can be seen here.
The old AL series catalog can be found here.
The AL□□-A series catalog can be found here.
For more information, refer to the “Lubricants Used to Supply Lubrication” section on the SMC website, which can be found here.
Details on the 1000 cm2 tank type can be found here.
Refer to the exploded view, replacement procedure, and parts list in the AW-B series operation manual, which can be found here.
Refer to the FAQs about the differences between N.O. and N.C. float type auto drains and their usage, which can be found here.