Showing all 5 results 20″ 316SS ASME Full Opening Manhole Assembly Civacon Petroleum Manhole Covers LM‐Plus Dry Bulk Manhole PAF 406-98 Manhole Pressure Relief Valve setting 3.63 psig Replacement Cam Latch Kit – 20″ Manhole Zinc PLATED Manhole meets requirements of 49CFR §178.345-5 and §178.347-3