Bilco RPRS2SS-E

A: RPRS180 are the black composite tubes, where as the old style are metal tubes. Please see this link to the new style: Click Here Is there a follow-up question I can assist with?

A: The only manufacturer that I am familiar with that uses a two spring model is a company called Dur-Red

and they do indeed have a two spring system which they call their Pressure Intensifier And we do have one of them listed in our site which is the Dur-Red 15 PI Pressure Intensifier for Normal Stair Hatch (NSH) - Galvanized Steel 36" x 72" as seen here:

Click Here

I would not recommend purchasing this unit as there are very likely several models of pressure intensifiers all are going to be related to the door size and door composition.

To proceed with a review of your requirements please reply to this email with photographs of the roof hatch that you have along with dimensions.