The S1S Series is an angle framed access cover with 300 lb. psf (1464 kg psm) load rating. Single and double door units are supplied with spring assists and are ideal for casting into concrete top slabs directly above submersible pumps and debris baskets. Standard features include lift assist and slam lock. This series can also be used for underground vaults that have provisions for drainage of incidental water. This Series should not be used if water intrusion is a determining factor. (See channel framed series W-R, W-S or W-C) If required the S1S Series can also be modified to fit existing openings. For more information on this modification please consult Victory Construction Products with your existing opening size(s) Drawing: https://hallidayproducts.com/assets/ser-s1r-n_catalog-2.pdf