The Caleffi KIT536535A 156 is a two-stage pressure reducing kit with 3/4" Press connections. It supplies a 536 PresCal HP valve, a 535 PresCal valve, a connecting coupler and an expansion-relief accessory, with pressure gauges.
Best for high inlet pressure installations where a single large drop would cause noise, cavitation or premature seat wear.
Specifications sourced from Caleffi North America technical literature. Last reviewed July 2026.
Key Features
Two-Stage Pressure Reduction
Staging the drop across a 536 PresCal HP and a 535 PresCal reduces noise, cavitation and seat wear compared with taking a large drop across one valve.
Complete Assembly Supplied
Ships as a matched set: one 536 PresCal HP, one 535 PresCal, connecting coupler and expansion-relief accessory.
Pressure Gauges Included
Supplied with pressure gauges so each reduction stage can be verified independently at commissioning.
Low-Lead Brass Construction
Wetted surfaces carry a weighted average lead content below 0.25%, meeting Section 1417 of the Safe Drinking Water Act for potable water service.
Technical Specifications
| Product Type | Two-Stage Pressure Reducing Kit |
| Connection Size | 3/4" |
| Connection Type | Press |
| Maximum operating pressure | 360 psi |
| Maximum working temperature | 180 deg F |
| Pressure Gauge | Gauges included |
| Product Series | Two Stage Kit |
| Shipping Weight | 8.9 lb (approx.) |
Documentation
Related Products
- Caleffi KIT536535A 053 : Two-Stage PRV Kit 3/4" NPT
- Caleffi KIT536535A 056 : Two-Stage PRV Kit 3/4" Press
- Caleffi KIT536535A 059 : Two-Stage PRV Kit 3/4" Sweat
- Caleffi KIT536535A 153 : Two-Stage PRV Kit 3/4" NPT w/ Gauges
Frequently Asked Questions
What is included with Caleffi KIT536535A 156?
The kit supplies a 536 PresCal HP valve, a 535 PresCal valve, a connecting coupler and an expansion-relief accessory, together with pressure gauges.
Why use two-stage pressure reduction?
Splitting a large pressure drop across two valves lowers the differential each valve sees, which reduces noise, cavitation and seat wear and gives more stable outlet control than a single valve taking the full drop.
What is the warranty on Caleffi KIT536535A 156?
Caleffi covers this product under its standard two-year limited warranty against defects in material and workmanship from the date of purchase. ZOT Supply is an authorized Caleffi distributor.
- Product Series:
- Two Stage Kit
- Product Type:
- Two-Stage Pressure Reducing Kit
- Connection Type:
- Press
- Connection Size:
- 3/4 inch
- Pressure Gauge:
- Included
- Max Operating Pressure:
- 360 psi