Overview Reviews Product Description (2) 1/4" NPT Opens at 75 PSI. Protects primary system air pressure by reclosing automatically at 70 PSI. Product Videos Custom Field Product Reviews (No reviews yet) Write a Review Write a Review × RV778A1 - Pressure Protection Valve Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments