AmeriVent Cap Size:4" It has a ACME nut

It has a ACME nut x 1/4" inverted male flare

Durable extruded rung locks are spring loaded to operate smoothly

Double-Ground Blade Cuts Wood On The Pull And Push Stroke To Help You Power Through Thick Branches Faster

Made in Italy

It's factory set at 150 PSI and 210F

AmeriVent Cap Size:4" It has a ACME nutThe AmeriVent cap is the first engineered vent cap to gain recognition across the country for its performance. Millions of them are now installed on homes and business structures to protect against wind conditions that can cause waste gases to spill back into the structure through the appliance draft hood. The AmeriVent cap is UL listed, and its patented design of ports and baffles keep rain and debris out of the vent. In addition, AmeriVent caps