If. System pipe lacks a P-Lip, it's a SPINO.
Back in June, Andy Wike at Smokingpipes blogged on the System pipe, reflecting on one of my favorite chapters in The Peterson Pipe: The Story of Kapp & Peterson, assimilating it and in a few in…
petersonpipenotes.org
"The P-Lip Mouthpiece
Of all the features that comprise a System pipe, the P-Lip bit is perhaps the most polarizing. Many lifetime Peterson enthusiasts swear by it; others spend hours on the forums advocating its abolishment. Mark Irwin suggests that this divisiveness among modern pipesmokers is a product of a misunderstanding of its history, function, and overall purpos
Indeed, while you will find System pipes with fishtail bits, the now iconic P-Lip mouthpiece is integral to Charles Peterson’s original System design.* The graduated bore mouthpiece and P-Lip button were two of Charles’ last System patents, final amendments to his original System design and crucial to its function."