X272935 - 3/4 inch Manifold Barb Plug SP Manifold Plug

Dimensions:
Length: 0.5625 inch (1.42875 cm)
Plug Width: 0.5 inch (1.27 cm)
Cap Width: 0.75 inch (1.905 cm)

These will work with:
X272900 - Master Spas 2 inch x .75 inch 4 Barb SxS Manifold
X272850 - Master Spas 2 inch x .75 inch 4 Barb SxSpManifold
55-270-2280

These will not work with:
X272910 - X278910 - Master Spas 2 x.75 inch S 4-Barb Ended Manifold
X272920 - 2 x 3/4 inch SxS 6 Barb Manifold aka 2 inch x .75 inch
X278930 - 2 inch x .75 inch SxSp 6 Barb Manifold
55-174-2320