From the product description, check product page for current description, price and availability:

Compact ball lock spunding valve features a 0-30 PSI gauge and now features an adjustable manual pressure pull ring relief valve (adjusts from 0-15 PSI). The adjustable manual pressure release can be removed, and a corny keg pressure relief valve installed in its place. The gauge features a standard DuoTight 8mm stem, and can be replaced with our DuoTight gauges, like our items C18, Z97, and E69 if desired.

Lots of ways to use this and upgrade it. If you want more accuracy than the manual adjustable spring loaded relief valve, you can upgrade with our item C16 DuoTight Blowtie valve, which has a rubber diaphragm valve which will always be more accurate at low pressures than the included spring loaded adjustable relief valve. If you do this, you will also need DuoTight Joiner, item number C70.

You can also replace the manual adjustable relief valve with preset keg relief valves like our item G65 (17 PSI) or B54 (0-30 PSI).

• The Most Difficult Spot to Check for CO2 Leaks
• Keg O-Ring Materials Selection! – EPDM, Silicone and Buna-N?
• Why Do I Have Bubbles in My Beer Line? Diagnosing and Fixing Kegerator Foam Problems
• Five Benefits of Using Corny Kegs As Fermenters
• Rebuilding & Reconditioning Homebrew Kegs!
• Food Safe Replacement Keg O-Rings in Bulk
• Hands on Review: Kegland DuoTight Fittings & EVABarrier Tubing!
• Why Won’t My Homebrew Keg Carbonate? Fixing Draft Beer Carbonation Problems
• What Does a Flow Control Faucet Do?
• Upgrade Your Kegerator – 6 Improvements!
• Serve Homebrew on Any Kegerator & Convert Commercial Kegerator to Homebrew
• Tips and Gear for Growler Filling
• What’s the Difference Between Ball Lock Kegs and Pin Lock Kegs?
• Checking for Draft System CO2 Leaks – Using The Pressure Gauge Method
• Tip: Consider Oetiker Stepless Clamps for Kegerator Gas and Beer Lines
• Hands On Review: Inkbird ITC-308 Dual Stage Temperature Controller +WiFi Version
• Universal Poppets Tips and Tricks!
• Convert Your Mark II Keg & Carboy Washer to a Recirculating Draft Line Cleaning Pump!
• Step by Step: Finding and Fixing Keg CO2 Leaks
• Kegerator Beer Line Temperatures & Reducing Foam with a Recirculating Fan
• Kegging CO2 Use Estimations and Calculations
• Step by Step: Balancing Your Kegerator Draft System
• Building a Simple Ball Lock Draft Line Flushing Setup
• Build a Recirculating Draft Line Cleaning Pump
• Home Brew Keg Roundup – New & Used, 5 and 2.5 Gallon & More!
• Damp Kegerator? Fix Kegerator Condensation
• Portable Draft Beer Serving Options!
• Homebrew Temp Controller Roundup! – Kegerator and Fermentation – concepts, applications and models
• Bulk Keg Orings and Keg Repair Part Numbers