Plastic Intalox Saddle replacement requires matching actual saddle geometry, polymer and physical packed-bed properties rather than nominal size alone. DAIER's verified 25–76 mm series contains an important non-monotonic relationship: from 38 to 50 mm, void fraction increases and packing population falls sharply, yet dry bulk density rises from approximately 63 to 75 kg/m³ while specific surface area remains relatively close. Cross-supplier replacement should therefore be based on exact size-specific data rather than intuitive size trends.

Plastic Pentagon Ring replacement requires matching actual element proportions, polymer and physical packed-bed properties rather than nominal size alone. DAIER's verified 38–76 mm series shows strong surface-area retention as packing size increases, while void fraction is non-monotonic: the 50 mm model reaches 97% void fraction, but the larger 76 mm model decreases to 96%. Replacement procurement should therefore compare actual dimensions, surface area, voidage, bulk density, packing population and dry packing factor before treating cross-supplier products as equivalent.

Plastic Super Intalox Saddle replacement requires matching the actual saddle geometry and physical bed properties rather than nominal size alone. DAIER's representative 25–76 mm data show that the relationship between packing population, surface area and dry bulk density is highly non-proportional: from 38 to 50 mm, element count falls by 75% while surface area falls only about 6%, and bulk density rises slightly. Exact model data should therefore be used for routine replacement and cross-supplier quotation comparison.

Plastic Cascade Mini Ring replacement requires matching actual element proportions—especially the characteristic low-profile height—in addition to nominal diameter and polymer. DAIER's representative 16–76 mm data also show that size trends are not sufficient for replacement decisions: from 50 to 76 mm, packing population falls sharply and dry packing factor decreases, while void fraction changes only slightly and dry bulk density actually rises from approximately 43 to 44 kg/m³. Exact size-specific physical data should therefore be used when matching an existing CMR bed.

Metal Nutter Ring replacement should match geometry, alloy and sheet thickness in addition to nominal size. DAIER's representative data contain important non-linear behavior: the 38 mm model is heavier and slightly less void than the 25 mm model, while 65 and 76 mm have identical 98.6% void fraction despite substantial differences in surface area, packing population and dry packing factor. Replacement procurement should therefore use exact model data rather than size-based assumptions.