Portals Plus 23045, Alumi-Flash Extra Wide Base w/481 Black Cap

The Portals Plus 23045 Alumi-Flash Extra Wide Base with C-481 Black Cap is designed for flashing roof systems where up to four penetrations of .375″ to 1″ in diameter pass through a single base. The unit includes a .060″ spun aluminum base, 4″ high, with an 18″ base diameter and an 8″ collared opening featuring two roll-formed sealing rings. The molded EPDM C-481 cap is supplied with the stainless-steel Snaplock clamp and the assembly is intended to form a mechanical, weather-tight pressure seal between the cap and base.

Key features:

• Supports up to four pipes sized .375″-1″ in diameter. 
• .060″ spun aluminum base unit, 4″ height, 18″ base diameter, 8″ collared opening with two roll-formed sealing beads. 
• Molded EPDM cap model C-481 paired with stainless-steel Snaplock clamp to form a mechanical seal. 
• Suitable for retrofit or new roof flashing where multiple penetrations are grouped through one base.

• SKU: 23045 (POR-23045)
• Product type: Alumi-Flash Extra Wide Base with C-481 Black Cap
• Penetration capacity: Up to four pipes sized .375″-1″ in diameter. 
• Base construction: .060″ spun aluminum; 4″ height; 18″ base diameter; 8″ collared opening with two roll-formed sealing rings. 
• Cap: EPDM molded cap model C-481 with stainless-steel Snaplock clamp included.

• Install and roof-in the spun aluminum base per Portals Plus instructions and the roofing membrane manufacturer’s guidelines.
• Insert the up to four penetrations (.375″-1″ diameter) through the base collar opening.
• Place the C-481 EPDM cap onto the collar so its internal grooves engage the two roll-formed sealing rings.
• Tighten the stainless-steel Snaplock clamp evenly to complete the mechanical seal.
• Inspect the assembly to ensure proper bead engagement and secure clamp fit.

Q: What penetration sizes does this model support?
A: It supports up to four pipes each .375″ to 1″ in diameter.

Q: What are the base dimensions and materials?
A: The base is made of .060″ spun aluminum, 4″ high, with an 18″ base diameter and an 8″ collared opening with two sealing beads.

Q: How does the C-481 cap seal to the base?
A: The molded EPDM cap seats onto the collar beads and the included stainless-steel Snaplock clamp completes the seal.

Q: Are the clamp and cap included with the base?
A: Yes. The cap model C-481 comes with the Snaplock clamp for sealing the cap to the base.