ST201. An articulating sight tube with 90° swivel.

ST201. An articulating sight tube that can flex but stays in place when the water column is full.  Comes standard with a 90° fitting and a tube just over 12”. *Patent Pending*

ST201XL is the ST201 sight tube plus a removable extension tube that extends the water column of the ST201 to over 28“ that gets you to 1psi of water column. *Patent Pending*

ST201XL_Ext_Only is the removable extension tube only to turn the ST201 into an ST201XL.