Technic Systems offers...
Modular Plug In Standard Series

Filters 1/4" to 3/4"
Regulators 1/4" to 3/4"
Lubricators 1/4" to 3/4"
Filter cum Regulators 1/4" to 3/4"
Filter cum Regulator with Lubricators 1/4" to 3/4"( 2 piece design)
Filter, Regulator & Lubricator 1/4" to 3/4" ( 3 piece Design)
All the above are also available with Shut off Ball Valves
Mini Series

Filters 1/8" & 1/4"
Regulators 1/8" & 1/4"
Lubricators 1/8" & 1/4"
Filter cum Regulators 1/8" & 1/4"
Filter cum Regulator with Lubricators 1/8" & 1/4"  ( 2 piece design)
Filter, Regulator & Lubricator 1/8" & 1/4" ( 3 piece Design)

Standard Series

Filters 1/4" to 3/4"
Regulators 1/4" to 3/4"
Lubricators 1/4" to 3/4"
Filter cum Regulators 1/4" to 3/4"
Filter cum Regulator with Lubricators 1/4" to 3/4"( 2 piece design)
Filter, Regulator & Lubricator 1/4" to 3/4" ( 3 piece Design)

Large Series

Filters 1" & 11/2"
Regulators  1" & 11/2"
Lubricators 1" & 11/2"
Filter, Regulator & Lubricator 1" & 11/2" ( 3 piece Design)

Accessories
Guages, Automatic Drain in place of Manual Drain, Mounting Brackets