Click here to download the full Cross Reference Chart Select any of the following Series of R. G. ALLEN to view it’s HTR- Equivalent(s): SQZB/SQZC/SQZD SQHG/SQH SQM MPC RER/RZG SQ SPS SQC KNP RP-TYPE ‘U’ KNP RP-TYPE ‘V’ KNS KNH