Pump Unions and Related Parts

Pump Unions and Related Parts

Pump Unions and Related Parts

This is a chart for the outside Diameter of your plumbing pipes or Threaded Fittings so you can figure out what size parts to order. Note: The actual size a part is called is not the actual size of the hole in the part it is really the Inside Diameter of the pipe that would glue into that part which doesn’t make sense, since you cannot see inside the pipe. Therefore I am giving you the measurements of the outside of the pipe so you know what size part to order.  For example a part that ½” plumbing would glue in to, would actually measure ¾” inside the hole of the part and on the outside of the pipe that glues into the part.
Pipe Outside Diameter chart:
½” Outside Diameter is ¾”
¾” Outside Diameter is 1”
1” Outside Diameter is 1 ¼”
I have never seen 1 ¼” in Hot Tubs
1 ½” Outside Diameter is 1 ⅞”
2” Outside Diameter is 2 ⅜”
2 ½” Outside Diameter is 2 ⅞”
Threaded Parts Outside Diameter Chart:
1” Pump Thread Outside Diameter is 2”
1” Pump Union Thread Inside Diameter is 1 13/16”
1 1/2” Heater Union or Pump Thread Outside Diameter is 2 7/16”
1 1/2” Heater Nut or Pump Union Inside Diameter is 2 5/16”
2” Heater Union or Pump Thread Outside Diameter is 3 1/16”
2” Heater Nut or Pump Union Inside Diameter is 2 15/16”
2 1/2” Heater Union or Pump Thread Outside Diameter is 3 11/16”
2 1/2” Heater Nut or Pump Union Inside Diameter is 3 9/16”

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  • 2X Universal 1 1/2" Pump Union O-Ring or Gasket Kit One of  Each Size This is an example of measuring a union Center to Center on the groove.. This one is 2" CTC..

    2X Universal 1 1/2" Pump Union O-Ring or Gasket Kit One of Each Size

    Hot Tub Parts of America

    MSRP: $33.94
    $22.98
    NOTE: This gasket does not fit your Coleman SALUSPA DO NOT order it.. Click this link to see Saluspa Gaskets.. Saluspa This is a Set of 2X Universal 1 1/2" Pump Union Gasket/O-Ring Kit. 6 Items total..  There are three possible sizes on a...
    MSRP: $33.94
    $22.98
    Qty in Cart: 0
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    MSRP: $33.94
    $22.98
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  • Universal 1 1/2" Pump Union O-Ring or Gasket Kit One of  Each Size This is an example of measuring a union Center to Center on the groove.. This one is 2" CTC..

    Universal 1 1/2" Pump Union O-Ring or Gasket Kit One of Each Size

    Hot Tub Parts of America

    MSRP: $16.97
    $12.99
    NOTE: This gasket does not fit your Coleman SALUSPA DO NOT order it.. Click this link to see Saluspa Gaskets.. Saluspa This is a Universal 1 1/2" Pump Union Gasket/O-Ring Kit. There are three possible sizes on a 1 1/2" Pump union measuring in the...
    MSRP: $16.97
    $12.99
    Qty in Cart: 0
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    MSRP: $16.97
    $12.99
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  • LX Pump Union 11/64" Thick 2 5/8" Center to Center O-Ring World's Finest Pump Union LX Pump Union 11/64" Thick 2 5/8" Center to Center O-Ring World's Finest Pump Union

    LX Pump Union 11/64" Thick 2 5/8" Center to Center O-Ring World's Finest Pump Union

    Hot Tub Parts of America

    MSRP: $7.99
    $5.99
    This part is a LX Pump Union 11/64" Thick 2 5/8" Center to Center O-Ring World's Finest Pump Union. The O-Ring is 2 5/8" Center to Center across and 11/64" Thick where the standard O-Ring is about 1/8" Thick. This fits LX Pump unions that say...
    MSRP: $7.99
    $5.99
    Qty in Cart: 0
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    MSRP: $7.99
    $5.99
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  • Hot Tub 2" Sweep Pump Union To Plumbing Glue Connection Kit Hot Tub 2" Sweep Pump Union To Plumbing Glue Connection Kit

    Hot Tub 2" Sweep Pump Union To Plumbing Glue Connection Kit

    Hot Tub Parts of America

    MSRP: $82.95
    $67.99
    This Kit is a 2" Sweep Pump Union To Plumbing Connect Kit found in many Hot Tubs.   The 2" Sweep Pump Union which measures about 3" Inside the threads receives a 2"street X 2" Slip Slice Valve then you glue the 2" Street X Slip 90° fitting on...
    MSRP: $82.95
    $67.99
    Qty in Cart: 0
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    MSRP: $82.95
    $67.99
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  • Set of (4) Hot Tub Spa 2" Heater or Pump Union Gasket Combo (2) 2 1/2" Lip & (2) 2 5/8" Lip Gasket Set of (4) Hot Tub Spa 2" Heater or Pump Union Gasket Combo (2) 2 1/2" Lip & (2) 2 5/8" Lip Gasket

    Set of (4) Hot Tub Spa 2" Heater or Pump Union Gasket Combo (2) 2 1/2" Lip & (2) 2 5/8" Lip Gasket

    Hot Tub Parts of America

    MSRP: $31.96
    $14.99
    This Kit is a Set of (4) Total Combination of the Two Standard Size 2" Heater or Pump Union Gasket (2) with a 2 1/2" Lip Center to Center and (2) with a 2 5/8" Lip Center To Center. The purpose of this Combo Kit is if you don't know...
    MSRP: $31.96
    $14.99
    Qty in Cart: 0
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    MSRP: $31.96
    $14.99
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  • Hot Tub Spa 2" Heater or Pump Union Gasket Combo (1) 2 1/2" Lip & (1) 2 5/8" Lip Gasket Hot Tub Spa 2" Heater or Pump Union Gasket Combo (1) 2 1/2" Lip & (1) 2 5/8" Lip Gasket

    Hot Tub Spa 2" Heater or Pump Union Gasket Combo (1) 2 1/2" Lip & (1) 2 5/8" Lip Gasket

    Hot Tub Parts of America

    MSRP: $15.98
    $8.99
    This Kit is a Combination of the Two Standard Size 2" Heater or Pump Union Gasket (1) with a 2 1/2" Lip Center to Center and (1) with a 2 5/8" Lip Center To Center. The purpose of this Combo Kit is if you don't know which size you have...
    MSRP: $15.98
    $8.99
    Qty in Cart: 0
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    Price:
    MSRP: $15.98
    $8.99
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  • Set of (2) 2 5/8" Center to Center O-Ring Hot Tub Spa 2" Heater  or Pump Union ORing 
The O-Ring is 2 5/8" center to center and fits some unions but most unions are 2 1/2" center to center... Do not buy this O-Ring until you verify that you have a 2 5/8" Center to center groove in your union for this O-Ring to fit into.. 2 5/8" Center to Center O-Ring Hot Tub Spa 2" Heater  or Pump Union ORing

    Set of (2) 2 5/8" Center to Center O-Ring Hot Tub Spa 2" Heater or Pump Union ORing

    Hot Tub Parts of America

    MSRP: $15.99
    $8.99
    This Kit is a Set of (2) NON-Standard 2" Heater or Pump Union O-Ring that measures 2 5/8" Center to Center. The O-Ring is 2 5/8" center to center and fits some unions but most unions are 2 1/2" center to center... Do not buy this...
    MSRP: $15.99
    $8.99
    Qty in Cart: 0
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    MSRP: $15.99
    $8.99
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  • Set of 2 Watkins HotSpring Caldera Tiger River Hot Spot 2 5/8" Center to Center O-Ring Hot Tub Spa 2" Pump Union ORing 
Watkins HotSpring Caldera Tiger River Hot Spot 2 5/8" Center to Center O-Ring Hot Tub Spa 2" Pump Union ORing 2 5/8" Center to Center O-Ring Hot Tub Spa 2" Heater  or Pump Union ORing 
Watkins HotSpring Caldera Tiger River Hot Spot 2 5/8" Center to Center O-Ring Hot Tub Spa 2" Pump Union ORing

    Set of 2 Watkins HotSpring Caldera Tiger River Hot Spot 2 5/8" Center to Center O-Ring Hot Tub Spa 2" Pump Union ORing

    Hot Tub Parts of America

    MSRP: $15.98
    $8.99
    This Kit is a Set of 2 NON-Standard 2" Heater or Pump Union O-Ring that measures 2 5/8" Center to Center. The O-Ring is 2 5/8" center to center and fits some unions but most unions are 2 1/2" center to center... Do not buy this O-Ring...
    MSRP: $15.98
    $8.99
    Qty in Cart: 0
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    MSRP: $15.98
    $8.99
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  • 2X Jacuzzi Premium & Sundance 2 5/8" Center to Center O-Ring Hot Tub Spa 2" Pump Union ORing 
Jacuzzi Premium & Sundance 2 5/8" Center to Center O-Ring Hot Tub Spa 2" Pump Union ORing 2 5/8" Center to Center O-Ring Hot Tub Spa 2" Heater  or Pump Union ORing 
Jacuzzi Premium & Sundance 2 5/8" Center to Center O-Ring Hot Tub Spa 2" Pump Union ORing

    2X Jacuzzi Premium & Sundance 2 5/8" Center to Center O-Ring Hot Tub Spa 2" Pump Union ORing

    Hot Tub Parts of America

    MSRP: $15.98
    $8.99
    This Kit is a Set of 2 NON-Standard 2" Heater or Pump Union O-Ring that measures 2 5/8" Center to Center. The O-Ring is 2 5/8" center to center and fits some unions but most unions are 2 1/2" center to center... Do not buy this O-Ring...
    MSRP: $15.98
    $8.99
    Qty in Cart: 0
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    MSRP: $15.98
    $8.99
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  • Hot Tub 2" Pump Union Slice To Glue Plumbing Connect Kit This is an example of how this kit can be used..

    Hot Tub 2" Pump Union Slice To Glue Plumbing Connect Kit

    Hot Tub Parts of America

    MSRP: $61.97
    $54.99
    This Kit is a 2" Pump Union, Slice Valve, Spin Kit To Plumbing Connect Kit with Glue found in many Hot Tubs. The Pump Union which measures about 3" Inside the threads receives a 2"street X 2" Slip Slice Valve then you glue the 2" coupler to spin it to...
    MSRP: $61.97
    $54.99
    Qty in Cart: 0
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    MSRP: $61.97
    $54.99
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  • Hot Tub 2" 90° Pump Union To Plumbing Connection Kit This is an example of the way this kit could be used..

    Hot Tub 2" 90° Pump Union To Plumbing Connection Kit

    Hot Tub Parts of America

    MSRP: $47.97
    $42.99
    This Kit is a 90° 2" Pump Union To Plumbing Connect Kit found in many Hot Tubs. The Pump Union which measures about 3" Inside the threads receives a 2"street X 2" Slip Slice Valve then you glue the 2" Street X Slip 90° fitting on the slip side of...
    MSRP: $47.97
    $42.99
    Qty in Cart: 0
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    MSRP: $47.97
    $42.99
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  • This is an example of how this kit would fit together.. This is an example of how this kit would fit together..

    Hot Tub 2" Pump Union Slice To Plumbing Connect Kit

    Hot Tub Parts of America

    MSRP: $42.98
    $39.99
    This Kit is a 2" Pump Union, Slice Valve, Spin Kit To Plumbing Connect Kit found in many Hot Tubs. The Pump Union which measures about 3" Inside the threads receives a 2"street X 2" Slip Slice Valve then you glue the 2" coupler to spin it to win it on...
    MSRP: $42.98
    $39.99
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $42.98
    $39.99
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