Ritherdon Replacement Locks are designed to replace damaged or broken locks on Ritherdon Meter Box Repair Door and Frame units and Ritherdon Meter Boxes. The lock that will fit on your Ritherdon product may depend on its age as some of the designs have been updated. A summary of the locks used on the new and old models can be found in the tables below. For a more detailed guide on how to select a lock, please see our lock selection guide: Ritherdon Meter Box Lock Selection Guide Slam Cam vs Slam Lock Lock Selection Table - Gas Meter Installations Gas Model Current Model Lock Type Old Model Lock Type (Pre 2018) R7 G ED Slam Cam SLK20 Slam Lock R10G - All Sizes Slam Cam SLK12 Slam Lock R18G Slam Cam SLK12 Slam Lock R21G 2 x Slam Cam 2 x MCAM01 R22G Slam Cam SLK12 Slam Lock R23G MCAM01 MCAM01 R28G Slam Cam SLK12 Slam Lock R24H Lid MCAM03 MCAM03 R24H Door & Frame MCAM03 MCAM03 R24M Lid MCAM03 MCAM03 R24M Door & Frame MCAM03 MCAM03 R24M Tall MCAM03 MCAM03 Lock Selection Table - Electric Meter Installations Electric Model Current Lock Type Old Lock Type (Pre-2018) R7 E ED Slam Cam SLK20 Slam Lock R7E Slimline Slam Cam SLK20 Slam Lock R10E - All Sizes Slam Cam SLK12 Slam Lock R17E Small Slam Cam SLK12 Slam Lock R17E Medium Slam Cam SLK12 Slam Lock R17E Large 2 x Slam Cam 2 x MCAM02 R18E Slam Cam SLK12 Slam Lock R18E Slimline 2 x Slam Cam 2 x MCAM02 R20E 2 x MCAM01 2 x MCAM01 R26E SLK12 Slam Lock SLK12 Slam Lock R27E 2 x MCAM02 2 x MCAM02 R28E Slam Cam SLK12 Slam Lock Universal Overbox 2 x MCAM01 2 x MCAM01 R3 - All Sizes SLK12 Slam Lock SLK12 Slam Lock R5 - All Sizes SLK12 Slam Lock SLK12 Slam Lock R16 SLK20 Slam Lock SLK20 Slam Lock