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'''Dish Pro Twin:''' This unit is either one LNB or two LNB units inside one plastic housing with two outputs. Polarization is converted so everything is vertical polarity. The Dish Pro Twin will not work with older legacy receivers. Allows for the connection of more than four receivers. This unit points to two satellites in space.'''Dish Pro Twin:''' This unit is either one LNB or two LNB units inside one plastic housing with two outputs. Polarization is converted so everything is vertical polarity. The Dish Pro Twin will not work with older legacy receivers. Allows for the connection of more than four receivers. This unit points to two satellites in space. Adding receivers does not require replacement because it can feed the DP34 or DPP44 for up to 12 receivers. Systems with the DP Twin are designated xxx-22D.'''Dish Pro Plus Twin:''' Like the Dish Pro Twin this unit is two circular LNB units inside one plastic housing with two outputs. Polarization is converted so everything is vertical polarity. The Dish Pro Twin will not work with older legacy receivers. The Plus refers to an additional input which allows for a third LNB to be added, for connections to 118.75 FSS Ku-band satellite in addition to 110 and 119 DBS band. Allows for the connection of more than four receivers. This unit points to two satellites in space.'''Dish Pro Plus Twin:''' Like the Dish Pro Twin this unit is two circular LNB units inside one plastic housing with two outputs. Polarization is converted so everything is vertical polarity. The Dish Pro Twin will not work with older legacy receivers. The Plus refers to an additional input which allows for a third LNB to be added, for connections to 118.75 FSS Ku-band satellite in addition to 110 and 119 DBS band. Allows for the connection of more than four receivers. This unit points to two satellites in space. The addition of a 3rd dish or LNB allows it to point to three satellites in space. The term '''Plus''' typically indicates an additional LNB with the capability of receiving from more than two satellites.The term '''Plus''' typically indicates an additional LNB with the capability of receiving from more than two satellites. Dish Plus LNBs have a prominent “dp” logo.=== Unanswered Questions ====== Answered and Unanswered Questions ===Q: Is the shared plastic LNB cap a specific indicator of a legacy Dish 500 LNB versus a DP 500 LNB? All indications are that the unit with the shared cap is the twin and the one with individual circular caps is on the quad units, without regards to legacy or DP.Q: Is the shared plastic LNB cap a specific indicator of a legacy Dish 500 LNB versus a DP 500 LNB?<BR>A: All indications are that the unit with the shared cap is the twin and the one with individual circular caps is on the quad units, without regards to legacy or DP. Q: What is the easiest way to distinguish a legacy twin and a dish pro (DP) twin LNB unit?<BR>A: The DP Twin has two LNBs with an internal switch. The plastic housing is about 6" wide and appears identical to the Legacy Twin except for a prominent “dp” logo on the housing. The logo is the best way to distinguish legacy from DP.