
HP721
Model HP 721-125-580-ADR Model HP 721 is a single stage cylinder regulator available in brass (HP 721) or chrome plated brass (HP 721C) barstock for pressure control of non corrosive gases when pressure rise is not critical.
- Body/Bonnet
- Brass Barstock
- Diaphragm
- 316L Stainless Steel
- Nozzle
- Brass
- Seat
- PTFE Teflon
Features
- 1-11/16” 316L stainless steel diaphragm eliminates contamiOne piece encapsulated seat design includes a sintered fil2” dual scale brass gauges (psi/bar)
- Maximum inlet 3000 PSIG except for models with CGA 300
- External relief valve standard
Materials
| Body/Bonnet | Brass Barstock |
|---|---|
| Diaphragm | 316L Stainless Steel |
| Nozzle | Brass |
| Seat | PTFE Teflon |
| Seals | PTFE Teflon |
| Filter | Nickel-Plated Sintered Bronze - Micron |
| Seat Return Spring | PH17-7 Stainless Steel |
| Adjusting Knob | ABS Plastic |
Applications & Documents
65 Existing part numbers
- HP721-015-000
- HP721-015-001
- HP721-015-280
- HP721-015-296
- HP721-015-300
- HP721-015-320
- HP721-015-326
- HP721-015-346
- HP721-015-350
- HP721-015-500
- HP721-015-510
- HP721-015-540
- HP721-015-580
- HP721-015-590
- HP721-050-000
- HP721-050-001
- HP721-050-280
- HP721-050-296
- HP721-050-320
- HP721-050-326
- HP721-050-346
- HP721-050-350
- HP721-050-500
- HP721-050-510
- HP721-050-540
- HP721-050-580
- HP721-050-590
- HP721-125-000
- HP721-125-001
- HP721-125-280
- HP721-125-296
- HP721-125-320
- HP721-125-326
- HP721-125-346
- HP721-125-350
- HP721-125-500
- HP721-125-510P
- HP721-125-540
- HP721-125-580
- HP721-125-590
- HP721-250-000
- HP721-250-001
- HP721-250-280
- HP721-250-296
- HP721-250-320
- HP721-250-326
- HP721-250-346
- HP721-250-350
- HP721-250-500
- HP721-250-540
- HP721-250-580
- HP721-250-590
- HP721-500-000
- HP721-500-001
- HP721-500-280
- HP721-500-296
- HP721-500-320
- HP721-500-326
- HP721-500-346
- HP721-500-350
- HP721-500-500
- HP721-500-540
- HP721-500-580
- HP721-500-590
- HUS-HP721-500-000-D
Configure your order
Select the variables exactly as they appear in the manufacturer datasheet. The full part number is assembled automatically.
Delivery pressure
single select · 5 valuesDelivery pressure range; the value in parentheses is the supplied outlet gauge range.source: DELIVERY
Inlet connection
single select · 11 valuesCGA code of the inlet connection, or thread / tube fitting.source: CGA/INLET FITTING
Accessory
single select · 8 valuesAccessory mounted on the regulator outlet.source: CGA/INLET FITTING
Options
multi select · 5 valuesAdd-ons and test certificates — multiple choices allowed.source: ACCESSORIES
Select variables
More from this category
Why GPTech
Since 2000
Multidisciplinary expertise in gas and advanced piping systems.
UHP grade
Products for ultra-high-purity clean-gas systems.
Engineering support
From product selection to installation and maintenance.
Fast response
Professional quotes quickly — via RFQ or WhatsApp.
Applications
We serve hundreds of customers across diverse industrial segments.
Need a quote?
Talk to our engineer and get a fast, professional response.




